The Cadillac Ciel concept car gives us some clues about the upcoming big Cadillac's styling. Photo credit: General Motors Co.

It's no secret that General Motors (NYSE:GM) is working on a major overhaul of its old luxury brand, Cadillac. And it's no secret why: A successful luxury-car brand can be a huge source of profits, and profits are a big priority for GM CEO Dan Akerson.

Akerson just confirmed that the next new Cadillac will be a full-sized sedan, a true American rival to the Mercedes-Benz S-Class. In this video, contributor John Rosevear gives you the full scoop on the upcoming big Caddy, and a surprise: We may get a look at this big new car very soon.

Fool contributor John Rosevear owns shares of General Motors. Follow him on Twitter at @jrosevear. The Motley Fool recommends General Motors. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.