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.
Hm. Until you said that, I hadn't really considered the possibility. But now that you mention it, if Nolan does another 1.5 movies in one, as with DK, then we might actually see Bane "break" Batman (heck, maybe to Arkham). Then the city falls to The League of Assassins, and Batman still
has to save the day, despite being crippled / insane.