I dont like the idea of "stacking" Rabadon's Deathcap. You lose the passive effect you could get with other high AP value items such as Zhonya, Void Staff or Abyssal to name a few.

It does look like your native language isn't English but I suggest going over your work and doing a spell check or something. Other than that if you follow the other people's comments you should be good to go. :)

// Needs work, at the thought for Greater Mark of Scaling Ability Power, I was scared to death, it is not a very good mark rune and would never be taken as a choice. In my opinion, I think Greater Mark of Magic Penetration would fit better, also, this guide is incomplete, you just end it with early items, and that's not it, two death caps? Please don't ever go for two death caps, the passive does not stack, I would say something like Abyssal Mask would be nice. The rest looks nice and all, but it is not very eye-catching, I pretty much scrolled through it all because there's absolutely no colors or pictures, just walls of white texts. I see that you're probably a new guide creator, and that's no problem, read JhoiJhoi's Making a Guide Guide from top to bottom and surely you'll make your guide better. So, no vote for me now.

Personally Im not a fan of this guide, Ill tell you why going from top to bottom.

The way you choose your skills is well done and I agree wit that (Besides the fact you only took your ult twice.) Maxing Shunpo last on the new Kat is ideal along with her Q first for maximum farm and harass in lane. Her W allows you to escape the harass with her typical Q -> E -> W combo. So The skill part was well done.

The masteries were also chosen nicely though anyone should feel free to mix it up to however they believe it suits them. It's all about personalization. Though I use the same materies as you do Katarina.

As for runes I personally prefer to run Move Speed Quints on her mainly because it's easier for getting away, catching up and roaming if you chose to. It's great throughout the whole game. However with the new Katarina Flat AP Quints are more viable due to her weakened early game. As for marks Magic Penetration runes are far better then AP one. Mainly because the Magic Penetration provides better damage throughout the whole game and will allow you to get close to dealing true damage against some targets. I use seals of vitality as well, give a nice boost in lane allowing you to stay longer especially with Spell Vamp. As for your last runes, the Glyphs I really dont understand why you take cdr? Sure they provide a slight amount of cooldown reduction early game. However they're useless late game due to your passive. What you truly want are MR Glyphs they provide a nice boost in lane since you are most likely to fast a Magic damage dealer in lane.

As for Items I always go Boots 3 first unless Im facing LeBlanc or someone with extremely high early level burst where I may take a Negatron (Along with MR runes this negates most damage). As for your actual build I disagree. The new Katarina's core items are: Sorc boots, Revolver and Deathcap. The Rylais and Lich Bane are items I avoid mainly cause with Lich Bane we wont be auto attacking nor do we have mana. The extra bit of survivability the Rylais give isnt worth it. I would much rather take items such as: Abyssal scepter, Zyhonias hourglass.

Therefore I personally dont like this guide. If you really love playing Kat I suggest you look up TiensiNoAkuma on youtube and learn a bit more from him. I hope this helps you out a little. ^^

Runes:
Here are my critiques for your runes:

1) You should put alternative runes so your readers know that there are other options.
2) Ever try swiftness quints on Katarina? They work tremendously with her, just saying (;
3) Greater Glyph of Cooldown Reduction is pretty bad, you shouldn't get them. Better replace them with Greater Glyph of Magic Resist so you can mitigate your enemies damage.
4) Greater Mark of Scaling Ability Power is TERRIBLE! You should either be running Greater Mark of Magic Penetration or Greater Mark of Attack Damage.

Build:
Erm...............

1) You should NEVER get 2 deathcaps on a champion.. EVER. Lich Bane is pretty bad on Katarina since you will hardly ever AA during a full on combo. Only thing it would be useful for is the movement speed, but movement quints usually cover that.
2) You have NO defensive items. Zhonya's Hourglass / Guardian Angel play huge roles in Katarina builds.
3) Your skill sequence should be like this, as it provides most of the things Katarina needs to excel in champion killing and csing:


Will come back for a further review.. I am open to changing my vote if you are open to constructive criticism.