The Magic Kingdom will be open for 24 hours strait beginning on Wednesday, February 29th, 2012 at 6 AM through March 1st, 2012.

Normally a slow time of the year at Disney World, the NBA All Star Game will have just been played on the Sunday prior to the leap day on Sunday, February 26th, 2012 so this might be just the incentive to get visitors in town for the game to make it a week long vacation at Disney World.

Disney World is calling the promotion One More Disney Day:

http://disneyparks.disney.go.com/one-more-disney-day/