Mortal Kombat was announced for the PS Vita by Sony back in November 2011.
The version will have all the features and characters from the console versions. What the Vita version won't have is 3G functionality.
Mortal Kombat co-creator, Ed Boon, explains to Click why you'll only be able to play the game online via WiFi:
"You know what, Mortal Kombat runs at 60 frames per second and it’s a very crisp game. The experience we had with 3G, unfortunately, wasn’t one that we felt couldn’t provide the type of experience people want to have. It’s susceptible to external factors like where you are and what not. We really didn’t want to present something to players that might be a bad experience, so we’ve restricted it just to WiFi and local connectivity.”