The folks behind the last Batman film, "The Dark Knight," conducted an extensive viral marketing campaign to promote the movie. They're back at it in the hype leading to the final part of the trilogy being released next year, "The Dark Knight Rises."
The latest in the puzzle could be this grainy video footage of a breakout from Gotham City's home for the criminally insane, Arkham Asylum. Rumor is that they're fan-made videos and not official, but DC Comics' official Twitter account sent out the link, helping to fuel the possibility that they're legitimate.
In the most famous DC Comics storyline involving the villain Bane, Bane broke out all of the other supervillains from Arkham Asylum to wear Batman down before breaking his back and putting him in a wheelchair. (Since it's comics, this was, of course, temporary.) Whether that remains to be how things play out in the movie is yet to be seen, but you can get a peak at a potential future in these videos.