In term of Batman in another movie post Nolan-verse:
There's two things I would like to have happen... obviously happen well.
1) A JLA movie needs to happen at least 10 years from now. After mild to successful intro films about Green Lantern, Flash, Wonder Woman (I don't think a Martian Manhunter movie would fly on it's own.) as well as a well done Superman reboot.
Finally in a JLA movie, they would need to go focus on earlier days of all these characters. Most likely a post TDK Batman. And have Batman be the uncooperative prick who helps, but works on his own and figures out the plot and comes to everyones' rescue in the end.
I can imagine Kingdom Come-like scenes of a younger Superman having a candid convo with Batman trying to convince him to do the right thing, instead of trying to control Gotham using fear and intimidation, etc.
2) Another possible post Nolan Batman could be an adaption of THE DARK KNIGHT RETURNS with Miller as the writer/co-director (maybe). Set Decades after the third Nolan film with an aging Bats, and keep it basically true to the comic, with modifications of course to suit a movie.