The game comes out November (presumably the 10th) for the PS3 and Xbox 360 ONLY, no PS2 because they're using the Unreal 3 engine only available for the previously mentioned systems. No PS2 sorry. There ARE fatalities, no cheats are known since the game isn't out, this thread belongs in the MK vs DC forum. Inc ase you were also wondering, confirmed characters so far are
MK
Scorpion
Sub-Zero
Liu Kang
Jax
Kitana
Sonya
Shang Tsung

DC
Batman
Superman
Joker
Shazam(Captain Marvel)
Green Lantern (Hal Jordan)
Catwoman
The Flash (presumably Wally West)

Renders and other info can be found here.

Pleasse take the time to read the Community FAQ to learn the rules and policies of MKO. Welcome to the forum and enjoy your stay. On a final note, please don't use smilies if they are unnecessary to you post.

What Vash said, and dont spam the smilies. It's annoying. You do have the legal limit, but ust warning you.

Seriously, MODS please come take care of this.