A most fantastic movie indeed. Its not just watching a movie but watching a work of art. The whole film is breathtaking and watching it in 3D for the whole duration was simply stunning. If you have the option of watching it at an IMAX then pay the extra for it.
The 3D was so good that I would occasionally remove the 3D glasses to see what it looked like in 2D. Very likely to go and watch it again. Folks in Tokyo can go to the IMAX at Lazona Kawasaki.
Japanese trailer below - as like most Japanese trailers, it contains spoilers.
Avatar Japan
And how about Avatar on the iPhone?