It didn't take long for people to start doing art/photo manips/photoshops featuring Tom Hardy as Bane and Anne Hathaway as Catwoman, though for somewhat obvious reasons, people are having a lot more fun with the lovely Ms. Hathaway.
Note: I can't find the original authors for most of these, so if you are or know of the original author, drop me a comment and I'll provide an appropriate credit/link.
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.