I hate to say it, but I'm finding the trailers for this a bit disappointing. The graphics seem too colorful and cartoon like. Maybe the 3D effect will make it all worth while, but at the moment it's reminding me of "Final Fantasy", which wasn't all that great.
In the interview with Sigourney Weaver she talked about how they put so much "science" into the story... So I expect things to "make sense" scientifically in the storyline. But in one of the scenes I could have sworn I saw chunks of mountains "floating" in the alien environment. How are they going to explain that scientifically?
Also, the story is starting to seem kind of "preachy". It basically seems like a rehash of the "nasty old europeans took over the american indians" story. I don't like being preached at, even by James Cameron hiding behind flashy graphics.