Spotted some more Batman 3 talk over at Superherohype.com, who have posted an excerpt from Total Film who recently talked to Christian Bale about the follow-up to The Dark Knight quoting -

"Will we do a third movie? It's got to be the right story. You can't make something like 'The Dark Knight' and then come out with something disappointing.

"I would like it if people say, 'You'll never make a good third movie.' I say, 'OK, let's make a third movie in that case, let's prove them wrong. But that's just me. The fact is, I have to! I've signed up! Chris doesn't. So I'm in a bit of a fix if he says he doesn't want to!"

(Source - Superherohype.com / Total Film.com)