Cadillac Sixteen concept – Click above for high-res image gallery

There was a time, not so long ago, that if you wanted a proper fullsize luxury sedan (short of a Bentley or Rolls-Royce, at least), your choices were "largely" limited to the German three: the BMW 7 Series, Audi A8 and Mercedes-Benz S-Class. But that was before the Lexus LS came along, the Infiniti Q45 came and went, when Jaguar's XJ was still a tight fit (and an unreliable one at that) and the Maserati Quattroporte didn't really factor into the equation. Don't even get us started on underdogs like the Volkswagen Phaeton and Hyundai Equus, but you get the point. Volvo recently became the latest rumored to be joining the fold, and now it looks like Cadillac could as well.

Substantiating earlier reports, the latest batch indicate that the call for a fullsize Caddy to battle the German stalwarts came right from the top, from GM CEO Ed Whitacre. And why shouldn't it? After all, if the head of one of the largest corporations in the world needs a new ride, he shouldn't have to look to a competitor like his Japanese counterpart Toyoda-san was spotted doing.

As is often the case with such rumors, few details are known at this point. But the project is expected to slot above the upcoming XTS – the model that's slated to replace both the STS and DTS sedans – with a rear- or all-wheel-drive setup and arrive no sooner than 2014. So we've got a while to wait before we find out if there's anything to these reports. But they certainly are intriguing.

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[Source: Automotive News – Sub. Req'd]

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