I think a return for Ras would be a bit cheesy, but I could see a story bringing Bruce back to where his training began. Perhaps he finds himself unable to stand up to Joker at first, and seeks to reinvigorate himself returning to the routes of his skills. Or they could just like some architecture or something and want to shoot there, doesn't have to be a foreign localle, they've shown that several things can make up the design of Gotham.
