Update - More images of the Audi A6 prototype have been snapped. See bottom of article for details

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The next-generation Audi A6 has been spied in Norway during testing this week, giving us a first glimpse of the new mid-sizer from Ingolstadt.

It appears the A6 will take the same design path as the new A4, A5 and recently-spied A8, sporting a wider and flatter look that will no doubt give it a sportier aesthetic.

The curves of the current-generation car will make way for more angular lines, in a similar vein to Audi's most recent models.

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At the front, the wider grille and slimmer headlights are the major differences from the model on sale today, while the rear is still a mystery as the photographer was unable to snap the vehicle from the back.

However, online speculation suggests the new A6 will feature an LED strip between the tail-lights, similar to that expected on the next A8, and also seen on the new TT sports car.

Like the current car, the A6 will be offered in both sedan and 'Avant' wagon body styles, though if the status quo is anything to go by, the wagon is unlikely to make it to Australia.

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Powertrains are unknown at this point, though expect a mix of four-, six- and eight-cylinder turbocharged petrol and diesel engines.

The new A6 isn't likely to be revealed until some time in 2018, so stay tuned to CarAdvice for more updates in the meantime.


Update: Spy photographers have nabbed more images of the A6 prototype during testing, partially-revealing the rear of the next-generation model.

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However, the tail-lights are pre-production units, so the overall look could change significantly as the A6 edges closer to its release - plus it's still concealed under the swirly black-and-white camouflage.

Click the photos tab for more images