New Skins in the Store

Sabretusk Sejuani
Darkrider Sejuani

How unexpected.

PVP.net v1.52

Ranked Teams
Ranked Team roster size has been increased to a maximum of 9
Provisional Ranked Teams will now be automatically disbanded after a certain period of time to prevent name squatting
Made it easier to invite members of your Ranked Team to a group chat
Team Tags will now show up in more parts of the PVP.net and in game UI
Team Game invites will now play a different sound to differentiate from normal invites
Team Member status will now show up in the Team Profile screen so you can see who is online and available to play
Cleaned up the Ranked Team creation process to be more clear
Tweaked the Ranked Team matchmaking algorithm to be more accurate

Looks all fine and dandy. My only concern might be the length of time for deletion of a ranked team, and possibly (unsure about this) the obnoxious spamming of team names, if there is no option to turn them on and off in certain areas. That aside, all looks good.

Spectator
Fixed a bug where Spectators would sometimes get stuck at the loading screen
Fixed a bug where the last few minutes of a spectated game get sped up

So when will we be able to hop in and out of games in progress?

General
Summoner's Rift (Winter) has been removed from matchmaking
Chat windows and buddy tooltips have been re-skinned to be visually consistent with the rest of the buddy list
The horizontal “arrow button” scrolling (for when you have more than 4 chat windows) has been removed. Chat windows will now scale down their presence in the task bar so they all fit.
Text input focus stealing on new incoming IMs has been removed
Fixed a bug where chat windows would scroll down to the bottom for every incoming message, regardless of your current scrolling position

D: it's still winter! Why no more SR winter? I like the chat tweaks though, especially the scrolling one.

League of Legends v1.0.0.132
Sejuani, the Winter's Wrath


Frost (Passive) - Sejuani's basic attacks apply Frost, reducing enemy Movement Speed by 10% for 3 seconds.
Arctic Assault - Sejuani charges forward to deal magic damage and apply Frost to enemies. Sejuani stops upon colliding with an enemy champion.
Northern Winds - Sejuani summons an arctic storm around her which deals magic damage to nearby enemies every second. Damage is increased against enemies affected by Frost or Permafrost.
Permafrost - Sejuani converts Frost on nearby enemies to Permafrost, dealing magic damage and increasing the Movement Speed reduction dramatically.
Glacial Prison (Ultimate) - Sejuani throws her weapon, stunning the first enemy champion hit. Nearby enemies are stunned for a shorter duration. All targets take magic damage and are affected by Frost.

Ahri

Orb of Deception mana cost increased to 70/75/80/85/90 from 60/65/70/75/80
Spirit Rush cooldown increased to 90/80/70 seconds from 80/70/60

Minor laning nerfs. Still nothing in comparison to the Talon nerfs (given for the same reason). She'll still be usable, you'll just have to be a little more careful with your Q spam, and use of her ultimate.

Dr. Mundo

General
Base attack speed increased to .625 from 0.595
Attack speed per level increased to 2.8 from 2.5
Magic resist per level increased to 1.25 from .75
Burning Agony health cost reduced to 10/15/20/25/30 from 20/25/30/35/40
Sadism ultimate cooldown reduced to 65 from 75

Mundo wasn't bad prior to this, exactly... he just didn't do much for a team. His early game in lane was also pretty rough, and he was very dependent on items to do anything at all. These buffs, however, might not have been the appropriate response. Minor skill reworks may have been more appropriate. As is, however, he may make a good mid to late game bruiser now. The Burning Agony buff also justifies getting a point at level 4, now, in my opinion. The health cost is no longer suicidal.

Fizz

Implemented the following changes to Chum the Waters which were in Ahri patch changelog, but not actually moved into the patch:
Fixed a bug where Chum the Waters stopped working if Fizz died
Hitting an enemy who is immune to the Fish now causes the Fish to drop on the ground instead of fizzling
Using Quicksilver Sash now drops the Fish on the ground instead of causing the shark to emerge immediately
Added a 3-2-1 timer like Time Bomb
No longer hits nontargetable units like Vladimir in Sanguine Pool

Bug fixes, more than anything. I wondered where that timer had gone.

Graves

Buckshot Mana cost increased to 60/70/80/90/100 from 60/65/70/75/80
Collateral Damage
Initial damage reduced to 250/350/450 from 250/375/500
Explosion damage reduced to 140/250/360 from 140/275/400
Cooldown increased to 100/90/80 from 80/70/60

More Graves nerfs. Possibly too much so now, we'll see. Let's see... 4 nerfs in a row... crazieshado: "umadphreak?"

Jarvan IV

Mana per level increased to 40 from 30
Golden Aegis mana cost reduced to 65 from 75
Demacian Standard mana cost reduced to 55 from 60

Jarvan buffs? Not so sure he needed them, but can't say i dislike them either.

Jax (remake)

General
Base health increased to 551 from 506
Health per level increased to 88 from 83
Armor per level increased to 3.5 from 3.2
Added an animation to Jax's Joke
Relentless Assault - Passive (Remade)
Every time Jax attacks an enemy he gains 4-10% increased attack speed (stacks up to 6 times)
Leap Strike
Cooldown changed to 10/9/8/7/6 seconds from 13/11/9/7/5
Damage changed to 70/110/150/190/230 (+1.0 bonus attack damage)(0.6 ability power) from 20/45/70/95/120 (+1.0 total attack damage)(0.7 ability power)
Empower
Cooldown reduced to 7/6/5/4/3 seconds from 9/8/7/6/5
Damage changed to 40/85/130/175/220 from 60/95/130/165/200
Ability power ratio increased to 0.6 from 0.4
Mana cost increased to 30 from 20
Counter Strike (Remade)
Jax dodges all incoming basic attacks for 1.5 seconds. At the end of the effect, Jax deals 40/70/100/130/160 (+0.8 bonus attack damage) physical damage and stuns nearby enemies for 1 second. This spell deals an additional 10/15/20/25/30 damage for each attack dodged.
Grandmaster's Might (Remade)
Passive: Every third consecutive attack deals an additional 100/160/220 (+0.7 ability power) magic damage.
Active: Jax gains ability power equal to 25/45/65 (+ 20% of his ability power) and attack damage equal to 25/45/65 (+ 20% of his bonus attack damage) for 6 seconds.

Generally, Jax is going to have a stronger early game, and a slightly weaker late game. He'll still be strong though, and will probably now favor more of a bruiser style than a health-tank assassin style. I would definitely argue that the change to his stun is a buff, as well.

Nunu

Base attack speed increased to .625 from .613
Attack speed per level increased to 2.25 from 1.08

Here comes battle nunu! I quite like these buffs, as I do enjoy myself a good bit of nunu, but AP caster/support nunu were quite limiting playstyles.

Rammus

Powerball duration reduced to 7 seconds from 8
Powerball initial speed increased to 30% from 25%
Defensive Ball Curl damage return reduced to 15/25/35/45/55 from 20/30/40/50/60

Slight rammer nerfs. He'll still be strong with organized teams.

Riven

Base movement speed reduced to 320 from 325
Base health regen reduced to 10.4 per 5 seconds from 12
Health regen per level reduced to 0.9 per 5 seconds from 1
Broken Wings base damage increased to 30/55/80/105/130 from 30/50/70/90/110
Ki Burst base damage reduced to 50/80/110/140/170 from 50/90/130/170/210

Minor laning nerf to Riven. She'll still be strong, but will be a bit less faceroll. Possibly some reasoning to max Broken Wings more quickly now as well. Unsure. Will have to test.

Shaco

Jack in the Box duration lowered to 60 seconds from 90
Jack in the Boxes now show their remaining duration (in seconds) in their mana bar

Minor nerf to jungle shaco mostly. Not sure if he can still do double buff openings now. We'll see.

Skarner

Crystal Slash mana cost adjusted to 20/22/24/26/28 from 15 at all levels
Crystal Slash slow decreased to 20/25/30/35/40% from 25/30/35/40/45%
Impale cooldown increased to 130/120/110 from 110/100/90

I dislike the method of this nerf. Skarner, especially jungle skarner, needed a nerf, but this nerf makes his already weak lane (relative to his jungle), even weaker, but it only slightly nerfs his jungle, as his clear speed will still be stupid high, and mana will still not be an issue due to blue buff. Still, the slight reduction in successful gank potency and frequency is welcome.

Tryndamere

Base attack damage lowered to 56 from 59.2
Base health regen per 5 seconds reduced to 7.9 from 10.9
Mocking Shout attack damage reduction lowered to 20/35/50/65/80 from 20/40/60/80/100
Fury decay now begins after 5 seconds, as opposed to 8 second previously

More Tryndamere nerfs. May not have been necessary. We'll see. He might lose more lanes than he wins now. Unsure, as I don't play Tryndamere.

Vayne

Base movement speed reduced to 300 from 305
Night Hunter movement speed reduced to 30 from 40
Tumble bonus damage reduced to 30/35/40/45/50% from 40/45/50/55/60%
Final Hour Tumble stealth duration reduced to 1 second from 1.5

Vayne nerfs. About time. She'll still be decent though. She'll just have a little harder time in lane, and be a little less ridiculously strong with her ultimate up.

Veigar

Fixed a bug where killing a unit with Baleful Strike would not create the particle effect

Yay, bug fixes.

Vladimir


Transfusion cooldown reduced to 10/8.5/7/5.5/4 seconds from 12/10/8/6/4
Crimson Pact ability power to health conversion reduced to 1.4 from 1.8
Hemoplague no longer costs 15% of your current health and is now no cost to cast
Tides of blood health cost ramp up reduced to 25% from 50%

Vlad will now be much stronger in lane, but his late game takes yet another hefty hit. Overall buff or nerf? We'll have to see.

Volibear

Base armor increased to 20 from 17.5
Rolling Thunder
Damage increased to 30/60/90/120/150 from 25/50/75/100/125
Volibear now gains 15% Movement Speed for the duration. This bonus increases to 45% Movement Speed when moving toward enemy champions.
Fixed a bug where Rolling Thunder's attack would sometimes cancel against fast moving targets
Frenzy bonus health to damage ratio reduced to 15% from 18%
Majestic Roar damage increased to 60/105/150/195/240 from 60/95/130/165/200
Chosen of the Storm (Passive) cooldown no longer resets on death

The early game armor buff really helps. The damage on Rolling Thunder isn't hugely noteworthy, but the speed buff is quite nice. The nerf (yet again) to Frenzy was probably needed, and the Majestic Roar damage buff isn't hugely noteworthy either. Overall, slight early game buff, not much change to late game.

Warwick


Hunter's Call cooldown reduced to 24/22/20/18/16 seconds from 30/27/24/21/18

He's still not good. Buff more please.

Xerath

Fixed a bug where Mage Chains could sometimes stun the target for 2 seconds instead of 1.5

bug fixes, yay.

Items

Ionic Spark is now purchasable on Summoner's Rift and Twisted Treeline
Nashor's Tooth
Total cost reduced to 2735 from 2885
Ability Power increased to 65 from 55
Ninja Tabi
Dodge has been removed
New UNIQUE Passive: Reduces the damage taken from non-turret basic attacks by 10%
Stinger total cost reduced to 1090 from 1140
Sword of the Divine has been removed

Huzzah Ionic Spark! Finally, a health + attack speed item in SR (and TT). Ninja Tabi. The tank boots when they have no CC. Overall, probably worse than the old Tabi, but more reliable. Stinger was always a good item, but still, no one's going to buy it because no one buys Nashor's. (where's my runegorger, riot? D:)

Summoner Spells

Surge cooldown reduced to 180 seconds from 220

It'll still be used when it's used, and passed up when it's not. A buff, yes, but it's a unique enough spell that it'll probably be present no more than before.

General

Colorblind Mode
New mode which improves visualization of health bars and various graphical effects and animations for colorblind players.
Location (while in game): Options > Video > Advanced Options > Colorblind Mode (checkbox)
Blessing of the Lizard Elder no longer triggers on spell damage
Updated several Champions recommended items

Colorblind mode is... cool i guess? Not really sure how often it'll be used, but at the same time, I doubt it was all that difficult to code, so as long as someone's using it, it's worthwhile, in my book. Huzzah, red buff nerfs! Not that it really matters to any non-singed players, but still...

Art

Champions
Guqin Sona model scale normalized to better match her other skins
Splash and Loading Screen Updates
Classic Alistar
Classic Fiddlesticks
Classic Galio
Classic Janna (minor artifact fixes)
Classic Malzahar
Unchained Alistar (minor artifact fixes)
Bird of Prey Anivia
Team Spirit Anivia
Corporate Mundo
Bandito Fiddlesticks
Piltover Customs Heimerdinger
PAX Jax
Angler Jax
Shadow Prince Malzahar
Vizier Malzahar
Assassin Master Yi
Yellow Jacket Shen
Silent Night Sona
White Mage Veigar

Some of these were already changed, but it's cool. A lot of the "new" splashes are quite nice.