The Michigan Film Office announced this week that filming on the upcoming fourth "Transformers" will take place in that state, and in the process they dropped what is essentially an early synopsis for the film:
As humanity picks up the pieces, following the conclusion of Transformers: Dark Of The Moon, Autobots and Decepticons have all but vanished from the face of the planet.
However, a group of powerful, ingenious businessman and scientists attempt to learn from past Transformer incursions and push the boundaries of technology beyond what they can control – all while an ancient, powerful Transformer menace sets Earth in his crosshairs.
Bay has previously confirmed the film is set four years after the events in Chicago in the third film.
Source: Michigan Film Office