@gleencross: They need someone who isn't known for much who can then be known for being Bruce Wayne. Then that person has to have eyes-glued-to-the-screen-like chemistry with whomever they pick to actually be the joker (IMO Leto's joker is Jason Todd and not even a good one). Even if he's not in this one he will have to show up eventually or...well they failed at Batman again. It is by far his most important conflict with Joker pushing Batman to the edges of his sanity and testing his moralities which often spills out into Bruce Wayne's life. Then one top of that, they need to be able to fight (go figure) and if not just appear to be able to devastate opponents. I don't believe Affleck can fight (hollywood people have time to train this sort of thing so maybe) but I do believe he picked some stuff up along the way when he was crushing them mans in the warehouse. I don't think they have any of those things with Pattinson but what do we really know aside from a movie, a face, and his body of work. I want to be wrong but I am not holding my breath.