Jon Hamm
Pros: From Mad Men to Bat Man? Anyone who watches Mad Men knows that Don Draper is practically Bruce Wayne already. Hes smooth, he always knows what to say and he tends to get exactly what he wants in the end. His deep voice could be flexed ever so slightly to make a truly menacing Batman voice (hopefully better than Bales custom rasp) and hes got tall, dark and handsome written all over his face. Everybody wanted him as Superman but he's got a dark side to him that perfectly suits Bats.
Cons: Turning 41 next year, Hamm might be too old for the type of stunts they have in mind, but seen as Nolan has fast forwarded the franchise to where Wayne will now be in his early 40's (we are told eight years has spanned between the conclusion of The Dark Knight and where we find Batman in The Dark Knight Rises) that would actually make him the perfect age for a continuation of the series.