This is the teaser trailer for Inception, Christopher Nolan's next movie. It's hoped that once he's done with this one, it's on to another Batman movie, but who knows. There was talk for a while of him directing a movie adaptation of the 60s British TV series The Prisoner but he's apparently no longer involved, so my fingers are crossed.
After The Scarecrow, Ra's Al Ghul, The Joker, and Two-Face, who should be Batman's next enemy in the Batman Begins/The Dark Knight series? Well, as of now we know that Tom Hardy will play Bane and Anne Hathaway will play Catwoman.
Check out the master list for all the villains covered. I've pretty much run out by now. Obviously, there are more Batman villains, but not any of significance that I know of. As of February 2009, no one is confirmed as a villain. Not the Johnny Depp Riddler, not Phillip Seymour Hoffman Penguin, nobody.