As seen of on the Hey U Guys blog : an extended version of the superbowl trailer.
I didn't even realise that they'd chosen a title yet - Revenge of the Fallen - and managed to miss all of the Superbowl trailers this year so didn't know they'd released any footage. It looks to me to be about the same as the last one, although the miniscule time spent with actors in the trailer suggests it might be trying to be a bit darker than last time. It still has jumping Transformers spinning through the air in slow motion, so not much has changed, apart from the addition of an even bigger and more explodey bad guy... I hope it turns out well.
(Jazz is a Porsche, damnit, not a Pontiac)