Yesterday I was called for a screening where Paramount showed us a new trailer for the upcoming The Last Airbender, and I assure you: it will be awesome!
Everything went by so fast, despite the trailer was probably around two minutes. Forgive me that my memory isn't that good, and forgive my mobile phone for the low quality pic it took.
The trailer started with Aang running through a beautiful, lush rainforest/swamp environment for multiple seconds. Then he arrived at this cave, which he entered. As he walked in the total darkness, you could hear the narrator saying something like: 'You have a destiny.'
After a title card that said 'Paramount Pictures and Nickelodeon Movies present', epic images of the four bending styles flashed by. The only two shots I remember where those of an unknown Earthbending guy kicking two enormous rocks out of the ground and the Fire Nation Prince (I'm sorry, I've only watched the show a couple of times) kicking a huge amount of fire into the screen.
Then we saw a fierce confrontation of that Fire Nation Prince and the General played by the 'The Daily Show' actor, in which they yelled at each other what was best for the Fire Nation's future. The narrator had all these lines about 'faith' and 'destiny' and that there were people after him (Aang?).
Another title card that said 'this summer'. Then there were more shots: the gang flying on the furry bison, avoiding fireballs fired from the ships below, ladders pushed against a high wall that almost seemed to be carved out of the ice, fighting Water- and Firebenders at the same location (Northern Water Tribe), some dramatic character shots (one of them was a really 'touching/realistic' shot of the furious Fire Nation Prince marching across the deck of a ship, yelling 'I want him alive!' and one shot of one of the girl fighters with the fans jumping out of a tree [see the picture below])
It ended with Aang speaking to a large group of people (reminded me of the scene in James Cameron's: Avatar where Jake gives an encouraging speech to the natives) where he reminded them of the fact that although he was the restorer of balance, he could not safe the world at his own.
I'll contact my colleague if he knows some more about what we've seen, but for now, this is all I can remember of the trailer. It was funny because it wasn't scored yet, it was just sound effects, drumbeats and the narration, felt less epic than it would probably feel with a proper score.
I have no clue when this trailer will be out, but I bet that it'll be very soon. It was supposed to be a surprise (Paramount really wanted this to remain secret until the last moment) but I'm a big M. Night fan, so I thought you'd appreciate it if you'd hear some about this upcoming epic!
Feel free to ask me some questions, hope I'm able to answer them

BTW, here's the pic I managed to take:
