Yahoo! movies has a new Transformers movie trailer. A Digg comment has slightly more direct links to the videos. My favorite part- the original transforming sound effect! Add that to Peter Cullen doing the voice of Optimus Prime, and it could turn out well. Of course, I have my doubts- it is a Michael Bay film, after all (I'm not a fan of Armageddon). So you could call me cautiously optimistic.
And I recently saw the opening for Voltron- it's Peter Cullen doing the narration! Those 80's cartoons- the voice actors were shared so often! E.g., the voice of Starscream also did Cobra Commander.