In an interview with Shortlist, a British magazine, Michael Caine who is known to us as Bruce Wayne's trusty Butler, was asked about his involvement in the next Nolan Directed Batman. This is what he has to say:
As for the future... if they ever make another Batman I will be in, I will be the butler...
Then quickly backtracks and said:
But I don't know if they are ever going to make another Batman. If they do it won't be for quite a while.