Well, here's to hoping Cottilard won't be in the film then.
t: Personally, I don't want the League to return anyways.
Which loose ends do they need to tie up at this point though? As of now, Batman is on the run and the mob is in shambles. Basically the only loose end really is Batman needing to redeem himself in the eyes of Gotham's citizens. Cleaning up Gotham, including taking care of what's left of the mob of course, is a never ending fight, so that's not something that's going to have closure most likely.
If Cottilard is in the film, I take it she'll be the main antagonist with Bane as the villian just under her. Not sure about JGL though, have to wait to see who he's even playing. For all we know his character(if he is a Falcone)might be the one to get less screen time which I wouldn't mind since I'm not huge on another normal mobster type.