2011 Audi A8 - Click above for high-res image gallery

Camouflaged prototypes of the 2011 Audi A8 have been caught running the Nurburgring, and accompanying these newest shots comes word that Audi's reworked flagship will be available with a host of new powerplants.

According to reports, Audi's range-topper will continue to be available with a W12, but it's expected to grow from 6.1- to 6.5-liters and exceed 500 horsepower -- 50 hp more than the outgoing twelve. Stepping down from that would be a supercharged V8 with more than 400 horsepower and a cylinder management system that could shut down up to four cylinders.

To really get the gas mileage going, however, Audi is reportedly working on a new 2.0-liter diesel with two turbos that pumps out more than 200 horsepower. If the new powerplant comes to market, it would match Mercedes-Benz' BlueEfficiency four-cylinder in the S-Class. The new A8 is expected to debut at the Detroit Auto Show this January, with sales beginning in late 2010.

[Source: L'Automobile]

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