"I have a great deal of respect for him. He generates a great deal of excitement and energy. He's really a hands-on director. My son is a stunt man and worked in Chicago doing a lot of the driving sequences...he said he's a very, very diligent, hands-on guy. He creates a great deal of energy and puts everybody on their toes. I would certainly miss him. I think he's brilliant, his mind is unbelievable. Michael if you're [reading] this, I certainly hope you are coming back."
"It would be very difficult me to express any of the future on Transformers, but certainly the excitement that it's generated of where it could possibly go is up to anybody to figure out. I don't have access to any of that information."
Bay has indicated he is considering not directly Transformers 5 but so far there has been no official announcement one way or the other. Hasbro and Paramount want the next film in theaters by 2016 so it seems that all involved will have to make a decision by the end of the year as pre-production on the films have to start a good six months before principle photography begins and often even with a good lead time finishing all the effects before the release date has been a rush to the finish line so the more time Bay and Paramount take to make a decision the less likely they can hit make that target.
On a somewhat related note since interview was to promote next week's release of Age of Extinction on Blu-ray, here is a video with a brief appearance by Cullen as press get to drive the expensive sports cars from the movie.