It may be more than a year before Avatar is easily available for home viewing in 3D, but James Cameron's next 3D flick is already about to hit theaters. On Sanctum he's only executive producing and not directing, but don't be surprised to see his name and notes that the movie uses techniques pioneered by Avatar throughout the marketing campaign, which will include a tour hitting several southern states throughout January to show off the trailer in 3D. Scheduled to open February 4th, it's an action-thriller about a group of cave divers trapped underwater -- check out the regular 2D trailer embedded after the break.