What's The Mystery Cadillac In GM's Money-Back Ad?

The CTS Coupe's coming next year, the ATS and STS/DTS-replacing Cadillac XTS are in the works, but in Ed Whitacre's 60-Day Money-Back Guarantee commercial, there's a Caddy peeking out from under wraps. But which is it? Find out below. » 9/16/09 8:30am 9/16/09 8:30am