Well for starters, yes the game play is very similar just faster really. Everyone has their own combos and specials, ect. Practice mode is alot better now, telling you how much damage each hit does. Though still can't have the computer or second player fight back in practice
Kenshi still owns, with two new special moves, a teleport(Mind Warp) and another telekentic move called Telekentic Furry. Kenshi's second style has been changed to Judo which I think Jax had in DA. He of course still has the Katana, but his moves for it are much different.
Scorpion has all the same special moves he did in DA along with his old Teleport Punch, though now its a teleport kick instead. Scorpion's changes in styles is much like Kenshi's, his second style has been changed to a new one, Mia Ryu or something like that and again has a Katana but with very different moves.
No Raiden isn't evil, atleast not yet. He's just really pissed off.
Liu Kang is playable. No Kung Lao though. But Shujinko has both Kung Lao's fighting styles from DA.
I think that covers about everything.
Oh, and have a good one.
