Devin Faraci, my brother from another mother, and Badass Digest have seemed to score some major information about the basic plot of Christopher Nolan's THE DARK KNIGHT RISES. Obviously possible spoilers follow, so be wary.
In Devin's write-up, according to his source, he claims that not only is Anne Hathaway Catwoman but that she's not a villain at all, or at least by the end of the film she isn't. She and Batman team up to go after the villains from the first film, the League of Shadows, led by none other than Talia Al Ghul, Ras's daughter. Partnering with Bane (Tom Hardy), who is also a possible love interest, the League of Shadows apparently tries to finish what it started in BATMAN BEGINS. Somehow, Joseph Gordon-Levitt figures into all this, but it's not clear who he's playing, but as Devin puts it, he's "certainly an antagonist." I always thought that if they were to reprise the Joker character Gordon-Levitt wouldn't be a bad choice, but it doesn't seem likely that's going to happen.
Click on over to Badass Digest for more conjecture and info. If the scoop is good, I'm really happy that they aren't dropping those villains from the first film. Those guys seemed too powerful to just drop off the face of the earth, even if their leader died. Obviously Nolan's pulled the wool over our eyes before, but Devin seems confident that the information is legit, and so I'm convinced that it's probably right.