I saw the 15 minute preview last night, and agree that it looks pretty Disney.. I hated the look of the Na'avi.
As soon as the footage changed to parts of the movie on Pandora though, they were much more believable and less gay. The environments are insanely detailed.. and the 2D trailer doesn't do it justice
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I'm not overly excited about the story of the movie, but holy shit was the 3D and CG side of things amazing!!! A few bits from the trailer such as when he is "jacked in" to the alien body, is very cool. Awesome clever use of the 3D for trippy-drugged out effect.
So yeah, while it looks a little on the gay side, The 3D aspect is going to be great.