The ending is on youtube. FYI I already saw the movie in theaters BEFORE it was posted
But I saved it because it's just so good! It will tide me over till the blu-ray hits stores.
I loved when people clapped at Bruce's reveal in the youtube clip.
I admit, I'm harboring serious doubts as to whether that was real or if it was simply Alfred's fantasy.
Taking into account things like the air speed of the Bat (to get the nuclear device a safe distance from the city), the blast radius from the nuclear explosion, and the fact that Bruce bailed from the Bat over open water near ground zero (remember that we see him in the cockpit with five seconds left on the detonator), it's highly unlikely that Bruce Wayne did, in fact, survive.
To accept that he did survive, you have to accept that he survived the fall from the Bat, was able to shed himself of his costume (because the body armor would have weighted him down), was not caught in the nuclear fireball, was not burned by superheated water from the nuclear explosion, and, after all of that, was able to swim back to dry land from a distance of several miles.
The objection to all of this, of course, is "Autopilot patch." Yes, Bruce could have bailed from the Bat at any point once he got the nuclear device out over water with the autopilot engaged. But that would mean that Nolan didn't play fair in his narrative because he showed us Bruce accepting his fate and the timer ticking down from five.
In short, I think the final scene is up for interpretation. It it happened, I understand why Alfred saw what he saw. If it didn't happen, I understand why Alfred wanted to see it.