za wikipedia:

On May 30, 2007, Dreamworks greenlit two sequels to Transformers, and Shia LaBeouf, Megan Fox and Peter Cullen signed on to return. Producer Tom DeSanto has envisioned a storyline introducing the Dinobots, the Constructicons, and Soundwave. Writers Roberto Orci and Alex Kurtzman may not return, as "Star Trek... is taking up kind of all of our time." Michael Bay has not signed on, "trying to keep some leverage for the negotiations", but already has ideas, including an aircraft carrier character.