According to BATMAN-ON-FILM, several different sources have reported to them that the Batman who will feature in SUPERMAN/BATMAN will be older, and around mid-40's.
The website then seemingly suggests that WB is looking at Josh Duhamel, Jude Law, Gerard Butler, Josh Brolin, Jon Hamm, Brad Pitt, Ben Affleck, Jim Caviezel, etc.
So pretty much every decent looking late thirties-forties actor!
Take it with a grain of salt, but what do you guys think?