I suspect the early speculation that Avatar2 will be about the Pandoran Undersea people is a tactical diversion. And while I don't necessarily believe there's an ophan planet NIBIRU on its way back into our Solar System in 2012, Avatar2 will most likely be about this symbolic RETURN OF THE ANNUNAKI to the dead (corporate) earth. It'll show how the remaining 'humans' on Pandora negotiated 'unobtainium' refinement and 'tree of souls' crystalline glimmering poperties in the name of a pre-emptive strike on a poisoned earth and a broken humanity, led by Jake Sully's Cain & Abel offspring. Imagine Tree of Souls SPACESHIPS flown by the spiritual elders and powered by hearts of purified 'unobtainium'.
I can picture the opening scenes now, a blue foot steps lightly off a glowing Federation of Light Ship. Pan up to Jake Sully junior, his full tribal regalia lifting in the anti-grav field, towering over the assembled corporate heads of what has become a City Planet like Star Wars' Coruscant ready to beg for their lives. And all the gullible Project Bluebeam idiots will suck it up like puppies at the teat, the weakness of humanity used against itself. People will LITERALLY try to worship these Blue Magicians sent back from times gone by to fix the Earth and liberate its people from Corporate Indenture. [source FREE'd PLANET]
But I don't suspect this is how it'll go - I suspect MASSIVE NUCLEAR FALSE FLAG attack from the pre-rigged descending Scully-clone/prodigal son decoy, taking out 1/5 of the human race and enraging the remaining 4/5s to go into Austerity Measures to fund the savage busting of some Blue Monkey ass leading to a(n Empire Strikes Back-like) scorched-earth routing of Pandora and a proper good hyper-dramatic cliff-hanger setup for the final Avatar film.
Place your bets, I know where my money is.