Spy photographers usually try to focus their lenses on test mules and prototypes, but this week, a camera-toting sleuth stumbled upon some filming for Transformers 4 on location at a General Motors proving grounds facility in Michigan. While Michael Bay's personal website has already shown us a handful of confirmed and potential characters for the movie, these images are our first live look at the Autobots including what appears to be the new Bumblebee.
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