A fedora-filled, non-flying Superman would certainly be interesting... problem is, Batman, especially in Nolan's films, has pretty much conquered film noir
-like crime stories. I wouldn't want to see any Superman taking on the mob. If he were jumping around fighting some kind of evil King Kong, on the other hand, that could be neat... In the past or present, I think we need an action-heavy Supes movie.
Oh, and there's a Superman Begins tv show. It's called Smallville
... but while it long since jumped the shark, I think it'll be some time before people will be ready for another look at his origin.