That's a very cool fan-made poster.
After watching the teaser trailer a billion times and then seeing in with Harry Potter, myself and everyone over at the NolanFans Forums are trying to figure out who the person or persons are to the right of Batman. Here's a brighter shot from one of the leaks :
It looks like someone is either holding out a gun, Weaver-Stance style, (Maybe JGL as John Blake) or someone is hanging or running toward the fight. The person appears to be wearing green, so the first thought that comes to mind is The Riddler, perhaps on a screen. It's hard to tell, but it seems like there may also be someone between Batman and the figure on the right, but then again, it's hard to tell. The HD Trailer will reveal all I'm sure. Some people have said that during their IMAX viewings of the teaser, Batman is soaked. So where does this fight between Bane and Batman take place? The Batcave, perhaps a sewer?
EDIT : The HD trailer is out now, showing much clearer shots of well...everything. The figure is not green like it was in the leaks, and does not move.
Oh, and if you want some laughs, check out this pathetic fuck :