Audi's performance vehicle lineup is about to get a new addition with these latest spy photos revealing what appears to be the next-generation RS6 Avant.

Based on the current generation A6 wagon, the test mule features a more bold font grille, as well as add-on fender flares to accommodate the wider track. Other hints include the use of some larger A8 wheels and some massive ceramic brakes.

Power for the RS6 is expected to come from the new 4.0-liter V8 twin-turbo engine found in cars like the S6, S8 and the new Bentley Continental GT V8. In the Bentley it makes 500 hp and 487 lb-ft of torque, while the S8 boasts 520 hp and 48 lb-ft.

See all the Audi RS6 Avant Photos at AutoGuide.com

Japan's aftermarket auto parts and racing expo, the Tokyo Auto Salon features displays by all major domestic automakers including Honda, Toyota, Nissan, Mazda and Subaru. Tuners from NISMO to TRD and Mugen display their latest products and point to the future of the Japanese tuner industry. The 2012 show promises to be a big one, thanks to the debut of the Toyota GT 86 and Subaru BRZ.

More: 2012 TAS on Autoguide.com

For some of the more minor auto shows, a Top 10 list of the most important cars often covers most of the new debuts, but not so at the North American International Auto Show. Held each January in Detroit it's the obvious launch site for major products by the Big Three domestic automakers and over the years has also become the venue for important new models by the rest of the auto industry.

Domestics made their mark at this year's Detroit show, starting with one very different concept car revealed by Chevrolet. Called the Tru 140S it may look like some outrageously fast and expensive exotic machine, but it's neither. Based on the same front-drive platform as the Chevy Cruze, it is powered by the same 1.4-liter turbocharged 4-cylinder, which makes just 138 hp in that car. Designed, along with the Code 130R concept, as part of an initiative to attract youth buyers back to the brand, Chevy seems serious about the concept, even announcing that if it made production, the target price would be around the $20,000 mark.

More: Top 10 Cars of the Detroit Auto Show on Autoguide.com