According to The Detroit News, Welburn has filmed a speaking part for the movie. He's only in it briefly, in one scene with star Mark Wahlberg, and Welburn himself still isn't sure whether the scene will be cut for the final movie--which hits theaters June 27.
Other scenes were shot in the Design Center lobby and staircase, as well as the executive garage and the center's virtual reality studio--appropriate, for a movie heavy on special visual effects.
Filming also took place in the company's aero lab and wind tunnels, and at the Tech Center entrance gate, GM's Milford proving ground, the Lansing Delta Township plant... essentially, it seems that the visual effects crew will have a lot of GM logos to remove from the background, if the scenes demand it.
A bright green Corvette will play the part of Autobot Crosshairs, while five Sonics were supplied for filming--a few of which were destroyed in the process.