Thanks to Yahoo's extremely reliable streaming media viewer, I had to glean this information in boring text form from Ain't It Cool News. Screenwriters Alex Kurtzman and Bob Orci hosted a chat mere hours ago where they answered fan-submitted questions about their upcoming Transformers film, and one of the revelations was the official list of which big robots are appearing.
In the Autobot camp, Optimus Prime, Bumblebee, Jazz, Ratchet and Ironhide will fight for good.
In the Decepticon camp, the Autobots will be out-numbered by Megatron, Starscream, Brawl, Bonecrusher, Barricade, Skorpinok, Frenzy and Blackout.
Kurtzman and Orci didn't reveal if the battle had a clear victor in the end. If Dane Cook gets eviscerated by a few Constructions, the winner is stand-up comedy.