James Cameron has announced that he is at work on Avatar 2 and Avatar 3, which he will be filming in one giant shoot (although he claims that they will be stand-alone stories that will link into a larger narrative) and releasing in December 2014 and December 2015.

In the meantime, you will have to content yourself with this 3D movie starring blue people, out in summer 2011:

(Updated to add: In other nerd-movie news, the next Batman movie is titled The Dark Knight Rises, and The Riddler will not be the villain.)