Hold on. DC/WB has signed Bale at minimum to a three picture deal involving Batman, he confirmed that in interviews. The original report was that Oldman, Freeman, Bale and Caine were all signed up that way but reports have continued that put those into question.
Bale has said he'll keep making Batman films until he is kicked out of them but has said that he would prefer to continue with Nolan. WB will exercise every option possible after TDK killer take and WB has issued statements that list that there will be a third Batman but Nolan is given the first crack at it, meaning he'd have to pass in order for it to another director. The speculation that has been occurring is of Nolan's involvement but remember he was so drained after the first he started talking about it being a one time deal. Oldman, Freeman and many other actors have been quoted as saying they know a third is coming but they all want Nolan to be at the helm. There IS certainty of a third but is no confirmation that Nolan will be involved and if he isn't then everyone expects the film to be completely different in look and feel.