Check this out -- you can go to the Avatar site and download Adobe software and an "interactive" trailer, which shows the preview and hotspots where you can, using the AIR software, sky off on profiles of the main characters. Click on the Download Interactive Trailer button.
This is pretty cool stuff. And I have to say, from what I've seen, this movie is going to set a visual standard for CGI nobody else will be able to touch. Whatever you think about Jim Cameron, the man is one helluva moviemaker.