re: What comes after Nolan's trilogy
Darren Aranofsky was rumored to be doing a Batman: Year One movie. That sorta went by the wayside. But yeah, he's the big name attached to what might happen after Nolan is done, because clearly, Nolan is done. Otherwise nothing Bat-oriented would be in the works by Warner Bros.
What Aranofsky does is anyone's guess. If he turns a script idea into a comic arc/graphic novel, ala The Watchmen, and puts that on the screen as a one-off, it could be cool.
But personally, I'd like to see The Dark Knight Returns graphic novel put to the silver screen. It is wholly separate from Nolan's universe, and it is a one-off, so it can bridge the gap until another director has a vision for either where to take what Nolan started, or gets the green light to completely reboot. But that's just me.
If you're interested in my take on The Dark Knight Returns going to the big screen, check out the column I did for legionsofgotham.org:
https://legionsofgotham.blogspot.com/2010/11/op-ed-article-bring-frank-millers-dark.html