Okay, this is the Avengers trailer I've been waiting for. Lots of Iron Man, Hulk, Loki, and the battle in New York. Also seems to show Hawkeye looking and feeling completely outclassed by the others, the exact thing that makes him such a great character. Nice to see some actual characterization and a touch of the plot shining through. And, hey, they're hinting at why Iron Man's on the team despite Fury specifically stating he didn't want him in Iron Man 2. This is looking better and better.
And for those in the UK, apparently you're getting a new name for the movie: Avengers Assemble. A slight change, but one that helps differentiate it from the other Avengers.