In an interview with the Reading Eagle, Transformers veteran voice actor, Peter Cullen, the voice of Optimus Prime, Ironhide and others in Generation One and Optimus Prime in the live action Transformers, talks about his work on Transformers over the years as well as his other projects.
In terms of Transformers: Revenge of the Fallen Peter comments that his voice recording sessions have already begun. "I worked with Michael a few weeks ago and we did some of the opening dialogue, the opening speech and then a couple of scenes with Shia LaBeouf. Shia wasn't there, of course. I just worked from the script.". When asked about the story to the second of three Transformers movies, Peter replied "They're very secretive about the story, I only know the lines I've read, and I'm not allowed to disclose any of those. But the amount of success that 'Transformers' had on a financial level is providing a lot more screen time for Optimus Prime. It's very expensive to do all these robot characters because of the 10,000 moving parts. Thankfully we were a hit, so there's 'Transformers 2' and maybe 'Transformers 3.' I think 'Transformers 2' is going to be an incredible, incredible picture. I can see the excitement in the faces of the people involved, and it generates quite a bit of excitement in me too."