Cadillac still working on S-Class-fighting flagship

Although Cadillac has talked about building a real flagship sedan for years (heck, we'd heard they were talking about it in 2006), a world-beating full-size sedan hasn't been a part of the lineup in, like, forever. And while the Cadillac XTS, a stretched version of the front-wheel-drive Epsilon platform underneath the… » 4/26/11 11:00am 4/26/11 11:00am