Speaking to the Wall Street Journal, Cameron said:
"For Avatar 2, what I'm most interested in is getting theaters to up their light level... And we want to shoot the movie at 48 or maybe even 60 frames a second, and display it at that speed, which will eliminate a lot of the motion artifacts that I think are causing some people problems."
He then continued, saying:
"I think it's because the image is strobing... That's a function of the 24-frame rate, which has actually got nothing to do with 3D. It's just made more apparent because the 3D is otherwise such an enhanced, realistic image, that all of a sudden you're aware of this funky strobing which you weren't aware of."
Certainly one of the most frequent complaints about Avatar was that the 3D made people feel sick, and it sounds like this is something the director hopes to eliminate with the new shooting method.
Avatar 2 is currently slated to hit theaters December 2014!