Not really sure how this will work out. I mean, it would need serious handling upgrades to come even close to scratching an X5M or a GL63, especially since the price tag will surely be on par with these two.
What I would like to see from Caddy however is a true luxury sedan. I believe they're already coming out with a 7 series competitor in the near future, and that's what I look forward to seeing.
But, as much as I love Cadillac and GM, if I'm looking for a luxury vehicle, I'll buy german. (Unless I want an Escalade, because its size is unmatched). They're just better cars.