Our own sister-site Cinematical picked up on this a few days ago, as it seems Alex Kurtzman and Roberto Orci, screenwriters on Transformers, have released a webcast full of new details and also reassurances that the writing team won't ruin many a geek's and auto enthusiast's favorite tale of transforming mechanized sentient robots.

The webcast can be found here, but here's a sample of what Cinematical learned while watching the 35 minute-long video:
  • Autobots will include Optimus Prime, Bumblebee, Jazz, Ratchet (Medical officer, will not be in the form of an ambulance) and Ironhide.
  • Decepticons will include Megatron, Starscream, Brawl, Bonecrusher, Barracade, Scorponok, Frenzy (started out as Soundwave, until they decided to change the character. Stealth spy) and Blackout (guy who comes in and takes out all of our abilities to fight back).
  • On why some characters look different than their original versions (i.e. Bumblebee's a Camaro Concept!): "Clothes don't make the man."
  • Contest announcement: (check the film's official website for details in the coming days) Write a line for Optimus Prime and the winning line gets put in the movie.
Also confirmed on the film's website is that Peter Cullen, the original voice of Optimus Prime, will return to voice the leader of the Autobots.

Here's a roundup of other Transformers movie news for those eager to hear Cullen say "Autobots, transform and ROLL OUT."
Character renderings
Behind the scenes video