According to Siliconera, Injustice: Gods Among Us will be coming to not just the PS3, Xbox 360, and Wii U, but also iOS devices as well. The game was shown at GDC, and is being developed in-house by NetherRealm Studios, who got into iOS design during the development of Batman: Arkham City Lockdown.
According to a tweet from Ed Boon, the game is being developed uniquely, and not as a port of the console versions. What this means as far as features or characters isn’t known just yet, and neither if its being released at the same time as the other versions.
For those of you asking… INJUSTICE for iOS is not a port of the console versions. It has its own unique game mechanic designed for iOS !!
— Ed Boon (@noobde) March 29, 2013
[Thanks, Game Informer]