New Skins in the Store

Heartseeker Vayne
Subterranean Nautilus
Abyssal Nautilus

Yay, new Vayne skin! It's been a while.

PVP.net v1.54

Co op versus AI
Added Ziggs, Master Yi, Nasus, Ezreal, and Nidalee to the bot roster
Players can now add many more of the Beginner bots to Custom Games
Spectator
Major item purchases will now be visually distinguished on the Scoreboard
Ranked Teams
Match History and End of Games stats for Ranked Teams are now accessible via the Team Profile
General
PVP.net will now wait for 8 seconds after a queue dodge before requeuing

More bots are good.

League of Legends v1.0.0.134

Nautilus, the Titan of the Depths

Staggering Blow (Passive) – Nautilus’ first basic attack against a target deals bonus physical damage and immobilizes the opponent briefly. Staggering Blow cannot trigger on the same target more than once every 12 seconds.
Dredge Line - Nautilus throws his anchor forward. If he hits an enemy, he'll drag himself to his target and his target to him. If he hits terrain, he'll drag himself to the terrain and the cooldown is reduced.
Titan’s Wrath- Nautilus places a shield on himself that absorbs additional damage based on his maximum health. While the shield is active, Nautilus' attacks deal damage over time to units around him.
Riptide- Nautilus slams the ground, causing the earth to ripple out in waves. Each wave deals damage and slows the targets hit. This slow decays over time. Multiple waves that hit the same target deal reduced damage.
Depth Charge(Ultimate) – Nautilus launches a depth charge towards a target that picks up speed as it travels. This charge knocks up all enemies it encounters while traveling and explodes on impact, stunning the target and launching them into the air.

Ahri

Spirit Rush
The allied ultimate HUD indicator will now remain green until all 3 spell casts are used
Cooldown between casts increased to 1 second from 0.75
Cooldown increased to 110/95/80 seconds from 90/80/70

Good nerfs. She was too strong. She'll still be very strong though.

Alistar

Pulverize mana cost reduced to 70/80/90/100/110 from 80/90/100/110/120
Headbutt mana cost reduced to 70/80/90/100/110 from 70/85/100/115/130
Triumphant Roar mana cost increased at later ranks to 20/35/50/65/80 from 20/30/40/50/60

Agressive play buffs, slight passive play nerfs, overall, probably buffs.

Cassiopeia


Fixed a bug where Miasma's slow was not stacking with many other slows in the game
Noxious Blast ability power ratio reduced to 0.8 from 0.9
Twin Fang damage reduced to 50/85/120/155/190 from 60/95/130/165/200

She'll still be playable, but these nerfs will hurt her laning in quite a few matchups.

Gangplank


Parrley mana cost increased to 50/55/60/65/70 from 40/45/50/55/60
Raise Morale range reduced to 1200 from 1500

Slight nerfs, won't break the champion, but will hurt his laning a small bit. The Raise Moral range reduction will also hurt GP's jungle ganks.

Heimerdinger

Fixed a bug where H28G Evolution Turrets could survive when Heimerdinger died if they were being teleported to

Bug fixes are good.

Irelia

Transcendent Blades' allied ultimate HUD indicator will now remain green until all 4 spell casts are used

Cosmetics are good.

Kennen

Thundering Shuriken cooldown increased to 8/7/6/5/4 from 7/6/5/4/3

Slight laning nerf, probably needed. Kennen's poke is very difficult to deal with.

Maokai

Vengeful Maelstrom's allied ultimate HUD indicator will now turn grey as soon as it is cast

Yay, cosmetics.

Nunu

Fixed a bug where Absolute Zero's slow did not grant assists

Yay, bug fixes.

Rammus

Defensive Ball Curl armor and magic resist values reduced to 40/60/80/100/120 from 50/75/100/125/150

This is a huge nerf to Rammus's mid and late game. It cuts down on his built in tankiness quite a bit, though I do think he'll still be a strong champion, definitely still viable.

Riven

Blade of the Exile's allied ultimate HUD indicator will now remain green until the shockwave cast is used

More cosmetics.

Ryze

Overload mana ratio reduced to 7.5% from 8%

Ryze is incredibly strong, and most likely still will be, but this nerf will definitely show up with his damage output.

Shen

Ki Strike
Damage increased to 10-112 (+10% bonus Health) from 10-95 (+8% bonus Health)
Cooldown is now reduced by 1.5 seconds whenever Shen attacks instead of 2 seconds when being attacked
Now grants Shen 10/20/30 energy when he Ki Strikes
Damage now scale correctly with all sources of bonus Health (% health runes, Juggernaut mastery)
Added a buff timer for Ki Strike's cooldown (like Ziggs' Short Fuse)
Vorpal Blade
Energy cost adjusted to 60 from 70/65/60/55/50
Damage adjusted to 60/105/150/195/240 (+0.6 ability power) from 70/105/140/175/210 (+0.75 ability power)
Heal effect changed to 6/10/14/18/22 (+2% of Shen's maximum Health) from 18/26/34/42/50
If Vorpal Blade deals the killing blow, it will now trigger 33% of the heal effect for Shen
Allied damaging spells can now trigger the heal effect, in addition to attacks (Vorpal Blade cannot trigger itself)
Feint
Feint duration increased to 3 seconds from 2.5
Energy cost reduced to 40 from 45
Shield amount adjusted to 70/120/170/220/270 (+0.6 ability power) from 50/100/150/200/250 (+0.75 ability power)
While Feint is active, Ki Strike’s cooldown reduction on hit is increased to 3 seconds from 1.5
Shadow Dash
Cooldown reduced to 10/9.5/9/8.5/8 seconds from 10
Energy cost increased to 120 from 120/115/110/105/100
Restores 40 energy per champion affected (rather than a flat 50 energy if you affect one)
Now deals 50/85/120/155/190 damage (+0.5 ability power) to Champions
Taunt duration adjusted to 1.5 seconds from 1/1.25/1.5/1.75/2
Shadow Dash now grants Shen 50% physical damage reduction from taunted targets
Stand United
Channel time increased to 3 seconds from 2.5
Shield duration reduced to 5 seconds from 7.5
Shield amount increased to 250/550/850 from 200/475/750

Massive overall shen buff. He might actually be viable now, as both a tank, and a support.

Shyvana

Fixed a bug where Flame Breath could shred the armor of shred-immune units (Dragon, Baron Nashor)
Dragon's Descent allied ultimate HUD indicator will now go grey immediately after using

Yay bug fixes AND cosmetics.

Sona

Power Chord damage adjusted to 10 per level from 14 + 9 per level
Hymn of Valor passive attack damage and ability power aura reduced at earlier ranks to 4/8/12/16/20 from 8/11/14/17/20
Aria of Perseverance passive armor and magic resist aura reduced at earlier ranks to 3/6/9/12/15 from 7/9/11/13/15
Song of Celerity passive movement speed aura reduced at earlier ranks to 4/8/12/16/20 from 8/11/14/17/20

early game nerfs to sona, but her late game will remain the same. Definitely necessary changes, though she'll still be a viable support in the hands of those who know how to play her.

Soraka

Improved Soraka's basic attack to be more responsive
Starcall mana cost adjusted to 20/30/40/50/60 from 35/40/45/50/55
Astral Blessing mana cost adjusted to 80/110/140/170/200 from 90/110/130/150/170
Infuse
No longer affects Soraka when cast on allies and cannot be cast on self
Ally mana restore increased to 40/80/120/160/200 Mana from 25/50/75/100/125

I personally think Soraka support is still very viable, though she may now be inclined to fill a more agressive support position, as opposed to the frequented passive support. Her solo laning capabilities, however, have taken a huge hit from this change.

Talon

Shadow Assault's allied ultimate HUD indicator will now go grey immediately after casting

Yay, cosmetics!

Vladimir


Crimson Pact will now correctly work with all sources of bonus Health (% health runes, Juggernaut mastery)
Hemoplague damage amplification reduced to 12% from 14%
Tides of Blood healing bonus adjusted to 4/5/6/7/8% per rank from 8% at all ranks

Huge nerf to Vlad, and arguably not a necessary nerf. His early game sustain will be a good bit more difficult to manage, and his damage output in team fights is being hit by the Hemoplague nerf. Still, he will be playable, but with a bit more difficulty.

Volibear

Fixed a bug where Majestic Roar could reduce minion movement speed to 0

Yay bug fixes!

Warwick

Eternal Thirst now deals 3-16 magic damage per stack, and restores an equal amount of health
Infinite Duress damage changed to 250/335/420 (+2.0 bonus attack damage) from 200/300/400 (+1.67 total attack damage)
Base attack speed increased to 0.679 from 0.644

Buffs to Warwick, with what looks to be almost a wit's end (as far as damage goes) built into his late game kit, and some bonus magic damage of a less drastic nature in the early game. His ult is also receiving a damage buff all game long, and he is recieving an early game attack speed buff, though it's slight. combined, I still don't think he'll be all that viable of a champion in most cases, but these are definitely steps in the right direction. He'll still fit where he used to fit, he'll just fit a bit better.

Wukong

Cyclone's allied ultimate HUD indicator will now go grey immediately after using
Fixed a bug where Crushing Blow could reduce the armor of shred-immune units (Dragon, Baron Nashor)

Yay, cosmetics and bug fixes!

Xerath

Arcane Barrage's allied ultimate HUD indicator will now remain green until all 3 spell casts are used

Yay, cosmetics!

Zilean

Fixed a bug where Chronoshift could prevent a clone from expiring, allowing them to survive indefinitely until killed

Yay, bug fixes!

Items

Sight Wards and Vision Wards now have a 0.5 second cooldown
Hextech Revolver spell vamp reduced to 12% from 15%

Yay, no more double warding! Nerfs to the revolver may not have been needed, but I think the item will still be worth getting. Certain champions will hurt more from this than others, however. Akali comes to mind.

General

The disconnect notification will now only be shown to enemy players if a player disconnects and remains disconnected for 5 minutes. The message will continue to be shown without a delay for allied players.
Heal and Clarity summoner spells will now restore health/mana to the caster even if they are untargetable when the summoner spell is cast (Fizz's Playful/Trickster, Vladimir's Sanguine Pool, Zhonya's Hourglass)
Baron Nashor can no longer critically strike, but his base damage has been increased 10% to compensate
Updated Baron Nashor's character stats so that his attack damage reflects how much damage he actually deals
Kill messages in chat now have team colors and display who was slain
Added Colorblind colors for Morgana’s spell shield and Spectator pings
Fixed a bug where some particles would flicker unintentionally
Fixed a bug where kill indicators were missing golden borders

Co-Op Versus AI

Improved Ashe's use of Enchanted Crystal Arrow on long range targets
Sivir will no longer get Sanguine Blade on Summoner's Rift
Changed the disconnect adjustment to remove the Fighter instead of the Tank on Summoner's Rift

Yay, bug fixes and usability tweaks!