Hmm, maybe Batman does die in this one but returns? Could that be what Gordon is alluding to in the teaser, "Then you were gone"?
Perhaps everything we're speculating about the film and the "death" of Batman actually does happen. I think we're definitely going to see Batman get beat down by Bane. Maybe after this happens, Gotham and Bane thinks Batman is dead when in reality, Bruce just excepts this defeat. Then with Batman "being brought to justice" for his crimes Bruce can move on to philanthropy as it's been rumored. He starts becoming a greater good as Bruce Wayne.
Then at some point Gotham turns to crap because of Bane, LOS or whatever and there's a need for Batman to return again. Something terrible obviously happens to Gordon and Bruce decides it's time to return.
Bruce Wayne goes back, trains (we get a bunch of training montage scenes that mirror him becoming Batman in Batman Begins) and then Batman "resurrects" so to speak. Gotham is shocked, Bane is shocked and Batman comes back better and stronger than before to fight once more and save Gotham from whatever the threat is. Then in the end Bruce decides that he can use the philanthropy aspects as Bruce Wayne and protect Gotham through Batman, making his parents proud. The best of both worlds.
Punishment/"justice", "death", going into hiding, training, rebirth, redemption and then Batman all rolled into one.
I don't think by the films end that Batman and/or Bruce Wayne have to die to serve the purpose of the story. "Die" sure, but this film will suck if they kill off the hero of Batman Begins and TDK permanently, with no return. Batman should only ever die metaphorically, but only for a time, not forever.