I really think it needs to be somebody between 30 and 35. A lot of the actors people are suggesting are good and would be great if Dark Knight Rises was more open ended and this was a loose continuation of Nolan's Batman (the way that Forever was of Returns for instance) but a lot of these guys are 40 or over and aren't good ideas for a new Batman that's teaming up with a Superman who is just starting out. I don't really want Batman to be THAT much more experienced than Superman. So for me, guys like Karl Urban, Nikolaj Coster-Waldau, Richard Armitrage, Anson Mount, Jim Caviezel and (ugh) Andrew Lincoln don't make a whole lot of sense and I don't know why people are suggesting them.