That's some pretty neat fan art. Cheers Glen for the heads up (he got it here).
According to Michael Caine, Johhny Depp is gonna play The Riddler in the next one, and Phillip Seymour Hoffman will do The Penuin. Both could be great, although I read somewhere the other day that Hoffman has deinied it. They better not call it The Dark Knigh Returns unless it IS The Dark Knight Returns, if you get me.