The Hollywood Reporter indicates that Hasbro has restructured their Hollywood properties (TV, movies, commercials, etc.) under Stephen Davis who was the president of Hasbro Studios. Before the change he was in charge of the development, production of distribution of Hasbro's TV properties like Transformers Prime and most of their original The Hub line-up. This change would make him in charge of Hasbro's movie slate from this day forward which includes Transformers 4.
“We are in the early stages of unlocking the full power of Hasbro brands globally, and this new group will capitalize on our talent and creativity on both coasts,” Davis said. “We are now in a tremendous position to expand our content and storytelling more impactfully across all screens around the world.” Davis will report to Hasbro's chief marketing officer John Frascotti who in turn reports to CEO Brian Goldner. From a Transformers perspective I don't think this really changes anything. Davis has been been involved with Transformers Prime since its inception so not someone unfamiliar with the brand. Since the movie franchise is still considered Michael Bay's baby, his influence will probably not really be felt on the movies until TF5 gears up.