I just realized we don't even have a Kasumi summary post (usually what is done at the beginning of each character's thread to let people know about what a character has or doesn't)
Anyway, here goes:
Normals:
Almost every single one of her normals are the same. The main (and rather gamebreaking) exception is her far C. She now does a one-handed palm thrust that cannot be cancelled rather than her old godly-ranged far C backhand, which made it a godly poke because of it's easy cancellability. However, despite its short range, it has major speed. If someone is hop whoring against you, you can stick this out and it'll almost hit as fast as an A to stop their rushdown attempt.
Otherwise, all the other normals are the same. They seem to have less "range" because of the nature of the game's playing field size.
Command moves:
f + A - Used to be cancellable on the second hit after a cancel off a normal, now you gotta do it off the first, making it less user friendly. Second hit still overheads.
A, C - This is something new that I JUST learned today. Basically, her std A can be CHAINED into her C, and instead of the close C coming out, the far C does. Interestingly enough, her far C animation usable at point blank range this year is VERY good because of its speed and how it hits (her arm becomes a straight line). On top of that, if you do this chain, you can cancel into any of her special moves. However, because the C knocks down, the only move you'll be able to combo into off this chain is her

+ K.
Specials:

+ P - A version is faster, C version is laggier but great for people who think they're smart and can roll the A version in a pressure string.

,

+ A is one of THE most annoying things you can do to slow the game's tempo down. Use and abuse.

+ P x 4 - Same as before. Can't tell the difference between the A and C version. Just don't finish it if this string is blocked, the last hit is extremely slow. However, she has a new addition to this string.
+ K which can be done after the 3rd hit. Basically a fakeout (thus cancelling the lag in the string) and a NASTY mindgame starter if you managed to connect with the initial hits of the string. std C, f + A (1 hit)

+ P x 3,

+ K,

x 2 + P is probably one of the most nastiest damage resets in XI.

, f + P - Her hit-based command grab. Has mediocre range. A version does fewer hits, but juggles higher, C version does more hits, but lags at the end and juggles lower. Take your pick.

+ K - Has the "juggle anywhere" property. Used for "on reaction" anti-air and as a finisher for some combos.

+ B/D/E - Her infamous command counter. B version counters special moves and air attacks. D version counters ground attacks, while E version counters low attacks. Seems like they made the recovery lag from this a little bit more worse, but it does amazing damage to stop rush whores in their tracks.
DMs/LDMs:

x 2 + P - Pretty much the same, shorter range because of the bigger screen. A version is instant but has recovery lag. C version takes longer to start up (possible use is to stop reaction rollers) and also has recovery lag. Does good damage if you can get it to hit............... if.

x 2 + P - Her SvC command throw super. Has JACK SQUAT for range (not even close to Clark's range), but adds a sick angle to her point blank mixups. Do not be afraid to use this DM, it does awesome damage.

,

+ E - Her LDM - old counter SDM from the previous KoFs. Rather meh in its practicality here because of its extreme "omgwtf hit me" factor if it whiffs, and for the fact that other people have better LDMs that can be more beneficial to the team in general. Turns into a grab if Dream Cancelled off her

x 2 + P command grab DM.
XI Kasumi is pretty much 2000/2001 Kasumi with more options. She's NOT a rushdown character at all, even though she has some capability to do so. She can play some mixup games, and albeit slow, they're incredibly effective. The ability to fake out the last hit of her

+ P x 4 alone gives her many opportunities to land her command grab, and once she has the opponent aware they can jump it, She can do even crazier things to mix you up after that fake.
Best played in a somewhat "in and out manner". Her normals allow her to play footsies with even the best of the tiers, but she's not meant to stay in your face for an extended period of time. Get in there, do your damage, get out, then start the process all over again.

+ P is a great harassing tool when you're about a character width and a half away, and she has a decent far ranged special poke with her

+ P x 4 (don't finish it of course). Her jump-ins leave much to be desired, but she's certainly (and is not supposed to be) no Kyo.
If you want a few examples of what to do with her buttons, see page 2 of this thread, I posted some stuff for various situations.
But yeah, Kasumi definitely has that "I'll come out of nowhere and own 3 KGOs and lose to some random lower tier character" capability.
