http://www.youtube.com/watch?v=u5BLgycbUogSony's ensemble fighting title, PlayStation All-Stars Battle Royale will be available on the PlayStation Vita and will be cross compatible with the PlayStation 3, Sony said at its E3 keynote.
Fat Princess, Sly Cooper, Kratos, Sweet Tooth and many other characters from PlayStation-exclusive titles were shown in a live demonstration on stage.
Here's another image of gameplay.