Coming from the Transformers Game Facebook page, some interesting info has surfaced in the last day or so (leading up to SDCC which will have more news revealed).

From tfw2005

The game for PS3, Xbox & PC will be out August 21st (August 22nd here) now, which is a week earlier than originally planned. (hope this means a better than expected game, as it isn't being rushed to meet deadline, or having its release pushed back to finish it)

Host migration will occur on multiplayer (which means that if the person starting a game, as the "host", leaves or is disconnected, the game continues with someone else assigned as the "host". Note that the PS3 server is the real host, but the initiating player of a multiplayer game is called the host).

There will be NO collectors-edition of the game, to make sure everyone has the same "great" experience.

A multiplayer trailer is in the works, and will be released soon (possibly at SDCC).

And a new trailer is posted up with Optimus and Metroplex.