Now we have confirmation that Cameron has shared some of those plans with his cast following the film's record-breaking box-office haul. "There have been conversations about certain ways to go," Joel David Moore, who plays human scientist Norm Spellman, told MTV News. "Of course nothing's set in stone. I love all the ideas.
"There are a lot of places for it go and all of those decisions lie in one man's brain," he added about Cameron. "And that is a giant brain. It is hard to feel smart around him."
At the end of the first movie, Spellman is allowed to stay on Pandora following the native Na'vi defeat of the human colonizers. And now we know Cameron expects to have Moore stay around for the sequel.
"Yes, I will be a part of whatever they want me to do," he said. "How can you not? I would love to go back to that world."
But what will his role on Pandora be now? During the final battle against the humans, Spellman's Na'vi avatar was fatally wounded. Will the character be avatar-less in the "Avatar" sequel?
"Anything can happen in a sequel and anything can happen on another planet," said Moore. "Understand that these things are grown from DNA from the Na'vi and us. A lot of things can happen."
Check out everything we've got on "Avatar."
For breaking news, celebrity columns, humor and more — updated around the clock — visit MTVMoviesBlog.com.