Well we know that since the Arkham breakout that the Narrows was in shatters. I have had a suspicion that we'd be revisiting Arkham somehow in the third movie. I believe that Nolan is going to bring everything full circle and wrap things up. I don't think the film is going to end with Bruce having his back broken as some have suggested, that would go against the title of the movie and Nolan LOVES playing around and exploring with his film titles meaning and motifs.