The test season at the Nürburgring is now officially opened and it looks like Porsche has been among the first automakers to take its model on the `Ring for some testing sessions. Our spy photographers have caught the revised Panamera out a spin and, as with the previously seen prototype, it wears almost no camouflage.

On the exterior, the Panamera->ke1840 will get new headlamps and taillights, plus redesigned front and rear bumpers. For the interior, Porsche will add improved materials and new technologies.

As for the engine lineup, you shouldn't expect any major updates, but it has been rumored that the 4S version will drop the current V-8 engine in favor of a twin-turbo 3.0-liter V-6 engine that will deliver about 420 horsepower - an increase of 20 horsepower over the current model -- at some point in the future.

Expect the revised Panamera to be unveiled sometime next month.

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