I didn't know it was coming, but Bane ended up appearing on the Cartoon Network's Young Justice episode "Drop Zone" that aired yesterday. It was a pretty typical interpretation of Bane, voiced by Machete star Danny Trejo. Io9 has some clips here, or if you live in the USA, it looks like it will be aired again Sunday at 8pm.
(and if you're a fan of Batman in comics, in addition to checking out Bane, you can be confused by the Robin who is apparently named Dick Grayson but has Tim Drake's costume and computer skills)
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.