DC and Warner Bros. have announced that they plan to make a Suicide Squad movie. This is Batman-news, because Deadshot would almost certainly be featured in any Suicide Squad movie, and it's doubtful that Warner Bros. would go ahead with production on two different movies with the same villain (since there's the chance that audiences don't like him in whichever movies comes out first, which in turn would tank the second movie).
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.