They're gonna get villains who are more realistic which is the theme of the series, so no one with any super powers. The riddler would be tight. I think they're gonna do two-face too, because it's never clear that he died. I would be very surprised to see penguin, poison ivy, of freeze in this movie. Harley quinn would be cool, but not without the joker and they can't recast the joker cuz that would be gay. Catwoman or the daughter of the bad guy from the first film might be good choices too, as a love interest for batman.