He seems to just do the movies he wants to do, but who knows? As for Keaton as Batman, apparently that's just for one film, and come on, Keaton is going to be SEVENTY this year. So unless they're doing Batman Beyond or DKR (which, come to think of it, can't possibly exist in a shared continuity), he's just a one-off.
https://www.cinemablend.com/news/256...t-got-debunked