Looks like that might be truer than we think.
Reports are coming in from a small theater in England that is apparently already showing the trailer. A message board poster who supposedly works there snapped this picture of the screen as proof:
The details of the trailer he provides have been independently corroborated by Ain't It Cool News. Here's what the trailer is like:
Gary Oldman voiceover, talking about how they needed him, then he had to disappear. Footage of Bruce Wayne walking up the mountain from Batman Begins, and surrounded by bats from Batman Begins. This is intercut with Gary Oldman looking like he is dying in a hospital bed, talking to what seems to be Bruce Wayne in the foreground. Footage of the batpod driving away from the camera from TDK. Then it goes black, and Tom Hardy as Bane in his mask appears for a moment, then disappears. Logo in a crumbling skyline, as in the poster, then the film name, then a shot of a worn out Batman about to fight Bane in the foreground.
We Dark Knight fans are free to wet ourselves now.