I personally think that given the 'prophecy' at the end of AC, they need to expand it into Gotham as a whole. Is it a bit ambitious in scope? Sure. But look at Rocksteady's record so far. It's not like they couldn't pull it off.
As for characters, Deathstroke would be fun, but dunno how they'd do that. I myself want to see them put Azrael in as a playable character because they had him in the second game.
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