It looks like a Dread might be back or at least have a new member. A Dread was spotted on the set in Chicago with the Pagani and Freightliner. Remember that a while back when Ratchet was spotted, a Chevy Suburban was also seen in the area. It could be proof of at least a cameo from Ratchet.
Also there are some new photos of Michael Bay checking out footage that was filmed as well as some explosion videos from Chicago.
First video thanks to Rich B.