It's a new fighting game that pits the entire Justice League against itself. The story goes like this.
The Joker did the ultimate evil to one of the Justice league members naming Superman by euthanasing Krypo Superman's dog, using Supe's Tivo to record every episode of My Little Pony: Friendship is Magic, crank calling, hiding the tv remote but most of all nuking Metroplis and killing Lois Lane and Superman's unborn child. This causes Superman to snap who in turn kills the Joker and creates a totalitarianism regime (Jur-El be praised)---and Superman still can't find the tv remote which adds fuel to the fire. So basicly Superman's the bad guy in this game.
This looks like a great game I've downloaded the demo on XBL and I might try to get my hands on the comic book of the same name. So what are you're opionions on this game.