VILLIANS:
To be honest the next batman movie will deal alot with him being hunted down. My guess is Black Mask will be the new mob leader. A lot of people say HUSH would need an origin story, but I think a few flash backs are fine.
Hush would be a hired assassin. The Riddler in my mind should be a cop, that goes mad of course. I picture him becoming obssessed with Batman. Say he goes crazy enough to secretly give info to the mob, while also stategicly planning riddles and attacks for Batman to face.
I doubt a female role is needed or the role of bane, they would all be cool to see no doubt. But the big question here is are they nessecary?
BATMAN'S ROLE:
I dont know what will happen in the end, but here what I have thought of...
1. Batman dies
2. someone takes his mantel
3. he does this forever