I'm not saying it wouldn't happen, I'm saying that they'd have to seek his blessing first before even considering something beyond.
Why would they have to? He doesn't own the character of Batman or Catwoman.
It may well be good manners to seek his blessing, but with him having opted to move on, I think he has to relinquish any ownership over the characters and setting. He doesn't have a veto over it all. They're WB and DC's characters - Nolan may have done great things with him but once he hands the toys back, that's it, someone else gets to play with them.