Paramount will unleash a new Transformers 3 trailer during the Superbowl 2010. You'll be able to watch this Superbowl trailer Transformers 3 Dark of the Moon here as soon as it is available online.
Update 1 - The Super Bowl trailer of transformers 3:
Update 2 - A crossover ad for Chevrolet has already shown up on youtube:
Super Bowl ad for Chevy with Bumblebee from the Transformers
The Superbowl Transformers 3 trailer will air on February 6, 2011.