Rumor has it that Batman vs. Superman will feature two Superman villains but no one from Batman's rogues gallery.
According to a Facebook posting by trusted fan site Batman-on-Film (via Batman-News), the Man of Steel sequel will feature a pair of Superman villains.
Perhaps Warner Bros. may be reluctant to use any Bat-villains since if they're going to unite DC's two (well, now three) most iconic superheroes then naturally viewers might want their biggest arch-enemies in there, too. Meaning Joker, who nobody would want to try to do again just a few short years after Heath Ledger's iconic turn.
In their Wonder Woman casting news story, Variety also mentioned that 300: Rise of the Empire actor Callan Mulvey is up for an unspecified villain role in the film.
Online scuttlebutt (and outright speculation) has claimed that the villain of Batman vs. Superman could be Doomsday, Darkseid, and/or Brainiac. Time will tell who the film's final villain(s) turn out to be.