Site reader Brian K. reports, with picture, that Transformers 4 production was filming this afternoon at the Russell Bazaar location in Detroit. He spotted a helicopter mounted with a camera, the Rally Fighter vehicle, Sonic RS Rally Car and two Cadillac Escalades. Later they changed their location across I-75 from the the Bazaar to the intersection of Harper and St. Antoine with the crew and copper. Exactly what is being filming is unknown.