As for this very cool Autobot logo with a touch of color, it was created by Pixel Rally's Jeffrey Marshall. It is not an official logo from Paramount or Hasbro. If use it for something, make sure to him and his site credit. A few his alternate designs can be found here.
"They are in the process of pre-production right now," Wenson told MLive Detroit, when asked if Bay's film crew is in town. "They are filming in several other states, too. The majority of their shooting, I believe, will be done in the state of Michigan.
"In addition to working on our stages, they’ll also be working throughout the state at different locations. We’re really excited that they’re here. We’re looking forward to the opportunity to service another film.”