I'd like to see Earth in the sequel. The mentions of it in the Activist Survival Guide give some tantalizing clues as to what life on are planet is life ~150 years into the future, but I'd like to see it for myself on the big screen.
However, given the almost six year time it takes to travel between Earth and Pandora, and that the film will be at least partially on Pandora with Jake and Neytiri, I don't think that a big break in the middle (especially not if it said "Six Years Later" on the screen...) would be particularly good. It would wreck the pacing and split the movie into two or more far too distinct parts.
My solution would be to show Selfridge and the rest of the RDA people arriving back at Earth in the first few minutes and the RDA execs discovering what happened on Pandora. They would then send an even larger force to Pandora to retake it. This is falling into the "RDA Strikes Back" model but frankly I don't see how the sequel can be much different. With the sky-high price of Unobtanium and it's vital role in Earth's economy the RDA would have to be insane to give up on Pandora.
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