SOURCE

From TFW2005
The official Vector Sigma Database - This database covers every character to appear in the Movie universe, including characters from the previous two films. It's very impressive and features pretty much the entire cast of the movie universe. A major revelation awaits on Soundwave's page - he is confirmed to be the Mercedes Benz SLS AMG! No more hanging around in orbit for him! A prototype of a MechTech weapon is shown on his page, indicating a MechTech toy is in development for him.
So much for Mercedes wouldn't let their car be a decepticon,
The twins are not in the move
etc