On the set of Transformers 3, an intrepid fan gets some shots of some of the vehicles, and a security guard plays Vanna White introducing a pair.
What is interesting is that he points at Optiums Prime (full with Trailer – please let him have Roller in there!) and then points at another massive firetruck and calls him Sentinel Prime
Now in the comic book series, Sentinel Prime was the former leader of the Autobots who passed on the Leadership Matrix to Optimus on his deathbed.
In Transformers Animated Sentinel Prime was an egotistical member of the Cybertron Elite Guard who mocks Optimus for washing out of the program.
In the film Transformers 2:Revenge of the Fallen Sentinel Prime is mentioned briefly in one of the spark induced trance speeches by Sam Witwicky.
I wonder how he will play out here?