The Vita version of Mortal Kombat, complete with 150 new Vita-centric Challenge Tower missions, touchscreen fatalities and the console version's DLC characters, will be available in North American on May 1.
Seeing as Mortal Kombat is part of the official EVO 2012 tournament selection, this may be a good way to squeeze in every possible second of combo practice during your daily routine. It's also a much cleaner, less illegal way to murder people while on crowded public transportation.