Avatar was first announced some time ago, and not much information had come with it. Just regular screenshots of in-game footage.
The trailer below shows the mutliple environments to be included in the game, along with the wide variety of enemies to attack:
Movie-games don’t usually turn out great, but Gameloft seem to have that covered. We’ll see how it survives on our iPod touches and iPhones when this lands in the AppStore on 15th December 2009.