Rocksteady/WB should fire their other writers and hire me and Ephemeris.
Rather than going straight out with Justice League, I'd love it if Rocksteady just expanded the city of Gotham into a full-on city, and then took on Snyder's approach that Gotham is a city that generates pure nightmare for its inhabitants. It is a reflection of that which has caused you the most fear and pain and suffering. That approach would work perfectly after all the shit Bruce has gone through. Thematically, it can tie into Hush as an antagonist of Batman, Azrael as a failed successor, The Red Hood as his son, so Bruce see his own failures as a father reflected, and The Court of Owls as his surrogate parents.
Fucking thematic narrative arcs everywhere up in this bitch.
Also: No more single night events. It borders on the hilarious that it's perpetually night and that all this shit happens in one single night. Rather, structure the game like a mini-series or series, with each side-quest as an episode and a long over-arching narrative that ties into the side-quests that ebbs and flows. The narrative in AA and AC begins to suffer as we get closer to the end and there's no room for it to breathe. Structure it like a series, each section with a beginning, middle, and end and a continuing story that drives the plot forward. I'd love to be able to play as Batman at night and Bruce in the day occasionally. Have the game take place over a few months. When the Court attacks, that you can make a one-night event at the climax of the game.
Thoughts on characters: Hush goes after Bruce when he gets wind that the Court is also making moves against him. He's the villain of the first part of the game and he wants his vengeance on Bruce Wayne. I like the idea of him continuing to skin people's faces to steal their identities. Hush can be the villain that gets Bruce's head back in the game. And then, from there, awesome shit happens.
After the Joker killed Jason Todd, he's brought back by the Court of Owls, brain-washed, and given the mask, and becomes their enforcer in Gotham. But he's still devious and clever and has his own plans and machinations.
Plus, we could do the labyrinth that the Court of Owls use to try and break Bruce:
The Talons would just be super-dangerous mooks, honestly. I dunno, there's more stuff we can think up.