Here's a brief interview with Peter Cullen I found on another site. Nothing necessarily earth shattering, but a good quick interview nonetheless Peter Cullen on Voicing Optimus Prime in Transformers: Dark of the Moon | Superhero Hype
I did notice, he said in the fourth one then added if they do it. There seems to be a few people connected with the films (tyrese) that seem sure there will be a next installment
