Body double?
The problem, styling at least, more on the platform later, is from the A-pillars forward. There's just too much grill in those pictures. I believe they were going for that 'chainlink' look in the grill, but it looks like metal when you smush the pic that small.
The rest looks good. I love the crease in the shoulder line, the small greenhouse, and the flared rockers. The rear looks like a stretched CTS, which lots of people love. And the ******** is gorgeous, to spite being a hodgepodge of other manufactures laced over the world-class CTS ********.
But now to the platform, I'm scared, really scared. The XTS when it's build and probably will be toned down from this concept, is likely going to be built on the Eplison II platform. Basically a stretched Buick LaCrosse platform. So the instant problems raise up. First, it's a FWD-biased platform, but being a Cadillac will likely come up AWD. Unfortunately it still will be FWD bias and not that fun to drive as a RWD platform. The second, is that there isn't a V8 option for this platform. I fully understand that V6 makes 350hp, which is a lot, but it's still not a V8. It won't have the same sound, won't have the same feel.
Fingers are crossed the 'experts' are wrong, but I don't think so. Lincoln did this with the LS, brought the MKS. But they want the XTS to compete with the 7-series and S-class. How many V6 7-series and V6 S-classes are sold here in the US a year? Anyone want to guess?
