From the DisneyMovieTrailers YouTube channel:
Walt Disney Pictures and the NFL are giving viewers an opportunity to enter The John Carter Journey to the Super Bowl Sweepstakes during the Super Bowl on Sunday, February 5, 2012. The Grand Prize winner will receive a trip for two to the 2013 Super Bowl game.
Viewers who are interested in entering the sweepstakes should tune into the game and watch for the John Carter commercial. During the airing of the 30-second spot, a code will be revealed. Viewers can then go to http://NFL.com/JohnCarter and input the code to be entered in the sweepstakes.