All right, I admit: in all honesty, Wonder Woman doesn't actually punch Batman in the face in these clips. She more sort of picks up a car and beats him senseless with it. The Flash and Superman have a similar car-related altercation, too. It's a bad game to be a car in.
You definitely can't decapitate Batman in Injustice, but there's plenty of other action you can still take, as is apparent in this new gameplay trailer, fresh out of San Diego Comic Con.