4. The Dark Knight Returns
Nolan has stated categorically that he is finished with Batman on screen. Directing the character at least anyway as he and his producer/wife Emma Thomas, and likely David Goyer and Jonathan Nolan will stay around and advise the next director on whatever incarnation and direction they take with the Caped Crusader. I know, its sad but we have to give him some credit for sticking to his guns and finishing a story when it should be finished, not holding out for more money or taking the job of helming the fourth just for the money. Of course just because Nolan is done with the franchise now doesn't necessarily mean he is done with the character forever. Could he return in 12 years time to do another? Why not? A fourth Nolan/Bale Batman film in 2024 might feature a much older Batman that is if he survives the third instalment. It could be based on The Dark Knight Returns, a comic many fans have been screaming out to see on the silver screen for a while now.
Who Would Star: Christian Bale in his 50's.
Likelihood as Nolan's Next Movie?: No Batman 4 for now but perhaps one day. Maybe if we all ask him really nicely.