SL is one of the last models on the track before the close of the testing season at Nürburgring. New on the SL will also be an extensive use of reinforced plastics and carbon fiber components.

Here are the latest spy shots of the next-generation Mercedes-Benz SL model, one of the last cars getting a workout on the Nürburgring as the testing season comes to a close there.

The SL is still wearing enough camo to mask its major design changes. But what they can't hide is the flatter nose that's become a distinguishing mark of the new Mercedes-Benz design paradigm. Other than that, the SL is staying close to its classic body shape.

New on the SL will also be an extensive use of reinforced plastics and carbon fiber components to help reduce weight and improve agility, performance and fuel-economy. Parent company Daimler earlier this year announced a deal with Japanese textile maker Toray Industries to help develop those materials specifically for this next-generation SL.

Engines expected, although it is a little early to tell, are the 3.5 liter V6 and the new 4.6 liter twin-turbo V8 from Benz's ever evolving stable of power plants.

The 2012 Mercedes-Benz SL will debut at the earliest sometime in 2011.

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