All-star cast doesn't equal good movie. I think about the steaming pile of poop that Batman and Robin was and get angry. Who ever did the casting for that movie should be hunted for sport. Cullen could be the voice for Prime, it wouldn’t be bad, but I won’t go in to a depression if he doesn’t. I really hope that this movie will feature talents of lesser known voice actors for the Bots and semi- known for the humans. My reasons are because I don’t want the big draw of this movie to be the flavour of the month being the star and the movie revolving around his love interest. Most of the budget should be the development of story and production, not the stars.