Same here, today I tried the demo and my first impresion was: I can't belive this is Mortal Kombat.
The game is awesome, the gameplay feels really smooth, the graphics are really cool and the characters have a lot of charisma and plays different as Boon said some time ago, Scorpion special moves are quick, Sub-Zero is slow but powerfull, Johnny Cage is the combo guy and Mileena the low tier lol.
The control layout is still 4 buttons, one to block (duh) and another for the Tag (in the demo you can only play single player so I can't test it) there are two kicks and two punchs (front and back) front punch + front kick is trow, two kicks + block is the X-Ray move and the "enhanced" moves is the command for the move + block. The X-Ray moves are not so easy to connect btw.
The only thing that really piss me off is the camera, it always appear to be in the center and does not give you the feeling of being in the corner, so it's a little hard to calculate the distance between the opponent and you.
Overall the game is easily the best mortal kombat, it has his flaws but it's a really nice start. Day one for me.
Edit: the IA is really bad too, hope they fix that later.