Which Avatar??????
There are two: The one that releases here soon, directed by James Cameron, which is what I believe you all are talking about. That indeed, looks like a great movie. I've heard that James Cameron sat on it for years, waiting for SFX and CGI FX to get to the point where he could make the movie true to his vision.
The other one is a live-action Avatar: The Last Airbender, directed by M. Knight Shyamalan. I'm looking forward to that one as well. Sadly, I have become addicted to that cartoon in this past summer.