DominicCobb said:

What they DO show, is that Bruce Wayne has made it very clear that it doesn't matter who's behind the mask. They also show that Gordon was given a new BATSIGNAL. And that Blake was given the BATCAVE, and when he goes in, BATS swirl around him just like they did to Bruce in Batman Begins. If you paid attention, it is very, very obvious that he becomes Batman.

except they never should him putting on the Bat suit. So for all we know, he becomes Nightwing or maybe Red Robin or something else.

DominicCobb said:

There is absolutely nothing to imply that he is Robin. If you watch all three films, everything is built from the ground up. Never is the audience forced to go off prior knowledge. In other Batman films you know why Bruce Wayne is Batman. But in Batman Begins, they tell you why. Why did they do this? Because this is a self-contained trilogy.

but it is still based on the comics and closely resembles the comics in many ways. Heck in this movie, Bane breaks Batman over knee exactly like he did in the comics. Also I think Alfred left Bruce for while in the comics and it had something to do with the Knightfall storyline.