He's a lot stockier than previous movie incarnations of the character. Plus, he has shorter ears, and the bat symbol on his chest is larger, but probably more subtle. Oh, and NO BAT NIPPLES, in case ya’ll were worried about that.
People are comparing it to the reinvented Batman from the 1986 comic series "The Dark Knight Returns", which was written by Frank Miller, the same guy who did "SinCity" and "300". Here's what that Batman looks like.