General Motors has revealed new details on its plans for the limousine variants of the 2013 Cadillac XTS, which made its world premiere at last year's Los Angeles Auto Show.

The XTS will replace the DTS sedan not only in the passenger car market but will also take its place in Cadillac's professional vehicle lineup.

At the upcoming 28th Annual International Limousine, Charter and Tour Show that takes place February 13-15 at the MGM Grand Hotel & Casino in Las Vegas, Cadillac will unveil the XTS "W20 Livery Sedan Package" for professional use, which from what we understand, will retain the regular XTS' wheelbase length.

However, GM said it is currently working on two more versions of the XTS, the extended sedan and limousine, which Cadillac Master Coachbuilder (CMC) licensed manufacturers can build for the chauffeured transportation market by the end of the year.

From the creators of the Ferrari 360 stretch limo comes yet another controversial supercar conversion, this time based on the Audi R8 V10.

Carbonyte UK will work in conjunction with Limo Broker to create the world's first super-stretched R8 and which it says is destined to become the signature model for the Limo Broker brand that also owns the Ferrari 360 Modena limousine.

Porsche tuning specialist RUF has beat the German brand in the presentation of a long-wheel base version of the Panamera sports saloon aimed at the plutocrats of China.

Named the Panamera XL for obvious reasons, the 5,370mm (211.4 inches) long Porsche received its public debut at the Guangzhou Auto Show 2011, which took place in November last year.

For some reason unknown to us, the Audi Q7 SUV has become an increasingly popular choice amongst stretch-limousine builders and promoters alike – especially after the demise of General Motors' Hummer brand.

You can find insanely stretched Q7s anywhere from the glamorous and glitzy Las Vegas Strip to the peaceful and scenic Greek coastal town of Nafpaktos, where these pictures were shot by Carscoop reader Christos P.

A Volvo and especially a 960 that has been transformed into a stretch limousine is a very unlikely candidate for a wild burnout. And true enough, as you can see in the video clip after the break, it's like watching the entire scene in slow moooooootion…