Various publications have been on a set visit to the Transformers movie and heard directly from Michael Bay and the people actually involved in the film itself. From that they've discovered a few details, but there's still not much to go on. They really are keeping the secrets close to their chest. Here are the main points they've gathered...

From Sci Fi Wire, here's the rundown of the plot:

18-year-old Sam Witwicky (Shia LaBeouf) discovers his grandfather's pair of century-old glasses, improbably laser-etched with a map and information about the location of a key artifact, the "Energon" cube, which he then tries to sell on eBay. The movie will follow five separate storylines, which will all converge with a final battle between the Autobots and Decepticons, starting at Hoover Dam and ending in an American city that looks a lot like Los Angeles.

Well there's nothing too revealing there. As for voices we heard that Prime will be voiced by Peter Cullen again, but what of Megatron and the other characters?

Voice casting of the Transformer robots is being left until later in the production...producers wouldn't say whether Frank Welker, who voiced Megatron in the 1986 animated Transformers film, would voice the character in the movie.

I think it's a fair bet to expect Welker back again. What do you think? If Cullen is then Welker must be.