Okay, this isn't supposed to be officially released until next week but some clever bugger has got it online for now.
The first avatar trailer was greeted with a mixed response and it now looks like Cameron is going all guns blazing with this new trailer. To be frank, it looks amazing, absolutely amazing. This trailer fills in the narrative storyline so we get a clear idea of what Avatar is actually about. On top of that the action looks spectacular. This is going to set new boundaries i think.
This is a low quality version but worth watching until the High Res version comes out next week.