[Confirmed] Stephen Lang will be back for the next 3 Avatar films

[Jachyra]

There was a lot of speculations before but this is coming straight from JC himself:

Steven was so memorable in the first film, we’re privileged to have him back,” Cameron said. “I’m not going to say exactly HOW we’re bringing him back, but it’s a science fiction story, after all. His character will evolve into really unexpected places across the arc of our new three-film saga. I really look forward to working with such a gifted actor, who’s also become a good friend.

Here's the link

Cheers!