Until now the only collaboration between VW and Porsche has been the Porsche Cayenne, which is a luxury version of the Touareg, a sport-utility vehicle made by VW. As the two companies get closer, Porsche's technology could boost the appeal of VW's more expensive models.

ECONOMIST: Volkswagen and Porsche

The 2014 version of the CTS midsize luxury sedan is aimed squarely at the BMW 5-Series.

WSJ: Hot Wheels: Cadillac to challenge BMW with CTS

Inspired by a local Victorian bathhouse that closed in 1986 after nearly 90 years, the Barking Bathhouse is a no-frills, low-tech and sustainable version of a modern day luxury spa and bar.

BBC: East London��s pop-up bathhouse

In a neighboring hall at the Paris show, Audi is teasing visitors with the eTron Spyder, a convertible version of the high-performance electric sports car the Volkswagen AG luxury subsidiary first previewed at the Frankfurt Motor Show a year ago.

MSN: A battery beats at the heart of these muscle cars

The modern version debuted seven years ago and Mercedes thus far has sold about 3, 000 of the luxury cars worldwide.

FORBES: Maybach: The $500,000 Mercedes-Benz Mistake

The A8 is a big luxury sedan, and the "S" designation means it's the hot, hot, hot version with a 360-horsepower V-8.

FORBES: Bigger, Faster And, Yeah, They Burn More Gas