Injustice looks great. Vita has become such a haven for fighting games, they're mostly all really good ports too. I might pick up Injustice at some point in the future.
I wish Vita was getting more racing games, though. They just work so damn well on handhelds. Though, I guess the volume of racing games releasing now is a lot lower than it used to be, so there's less to port across. Still, I wish they'd get Codemasters or some other studio who make racing games on board and start porting their stuff.