Bane would be a good choice. It would be nice to see Bane portrayed more accurately than he was in the god awful Batman & Robin film. I don't think Nolan would use Clayface for 2 reasons: 1. I'm not confident he could carry the film. 2. Nolan doesn't appear the type to rely on CG too often, and with Clayface it would require a lot.HobbesMkii said:Bane would be perfect. I know people are afraid of using characters from the Michael Keaton - Val Kilmer - George Clooney series, but screw that, Nolan isn't.
It should be Bane and Black Mask vs Batman. And it shouldn't be Robin, it should Batgirl. Introduce Barbara Gordon. It could work very easily, I think, just have her come back from college or university or whatever, and be inspired by Batman and her Father. Bane should definitely break the Bat, which forces him to rely on Batgirl, overcoming any earlier opposition to her aid (and teaching him that Batman can't always work alone, something already known to the comics).
Also, it sets up nicely a fourth film, in which you could introduce Harley Quinn and the Joker again (now given a suitable waiting period following Ledger's death for a new actor to play him) which is one of the most twisted relationships in comics, so that they could cripple Barbara Gordon.
You can't do Clayface for the Third Batman movie. Otherwise you'll draw comparisons to Spiderman 3 and Sandman.
Nolan seems to go for the psychological villains. In the regard I do think Scarface and the Dummy or the Mad Hatter is feasible as well. I'd love to see Freeze done properly too, but I doubt Nolan will take that road.
As for who could play Bane.....well anyone big and bulky could pull it off. The question is who could do it well. I do think Nolan painted himself into a corner with this film. Even if the third film is great, I still have this nagging suspicion that I will walk out thinking "Good film, but it's no Dark Knight" Still if he can pull off the third significantly better than his predecessors did with Spiderman 3 or Xmen 3, I will be happy.