When interviewed by the LA Times plugging the Earth Day dvd release of Avatar Cameron revealed his larger plans for the franchise's proposed trilogy:
"We created a broad canvas for the environment of film. That’s not just on Pandora, but throughout the Alpha Centauri AB system. And we expand out across that system and incorporate more into the story – not necessarily in the second film, but more toward a third film. I’ve already announced this, so I might as well say it: Part of my focus in the second film is in creating a different environment – a different setting within Pandora. And I’m going to be focusing on the ocean on Pandora, which will be equally rich and diverse and crazy and imaginative, but it just won’t be a rain forest. I’m not saying we won’t see what we’ve already seen; we’ll see more of that as well."
I may be in the minority that really enjoyed the film, but I definitely want to see where Cameron goes with this. His work in the oceans in The Abyss was something that had to be seen and if anything can be said about Cameron, the man knows how to wow moviegoers visually.