At the Scream 2008 Awards, the LA Times was able to talk to Christopher Nolan who talked a bit about a potential third Batman film:
“Well … let me think how to put this. There are two things to be said. One is the emphasis on story. What’s the story? Is there a story that’s going to keep me emotionally invested for the couple of years that it will take to make another one? That’s the overriding question. On a more superficial level, I have to ask the question: How many good third movies in a franchise can people name? [Laughs.] At the same time, in taking on the second one, we had the challenge of trying to make a great second movie, and there haven’t been too many of those either. It’s all about the story really. If the story is there, everything is possible. I hope that was a suitably slippery answer.”
So shaddup about Angelina Jolie, Philip Seymour Hoffman, Johnny Depp, John Candy, and Zac Efron.