I don't see an S650 in that video. Bodylines on the Grabber Blue pony look like an S550 to me. In the pixelated video here, the S650's side profile doesn't seem as boxy as the S550.
Ford Gives First Official Look At S650 Mustang Bodylines
In this new video posted by Ford, we get a first official look at the 7th-Gen Mustang's bodylines.