While all seven of the 3DTV-owners worldwide await the release of the Avatar Blu-ray in 3D, 20th Century Fox has announced that James Cameron has already signed on to direct Avatar 2 and 3, out in 2014 and 2015.
It's a long wait, yes. He'll begin writing the films early next year supposedly, and will begin work on Avatar 2 at the end of the year. Avatar 2 should be released in cinemas December 2014, and Avatar 3 a year later, presumably just in time for the hungry parents' credit cards.
Actors, plots and other sort of details haven't been confirmed yet (I doubt even Cameron knows himself, if he hasn't started writing them yet), but Cameron did say that the films "will not back off the throttle of Avatar's visual and emotional horsepower, and will continue to explore its themes and characters, which touched the hearts of audiences in all cultures around the world."