The fourth-generation Audi A8 has been spied undergoing testing on the Nurburgring Nordschleife.
Even with this prototype's head-to-toe camouflage, we can see that the new large sedan is heavily influenced by the Prologue series of concept cars. At the front, there's a wide, sharply-defined single-frame grille flanked by an angular pair of headlights.
While the sides are pretty flat, they're enlivened somewhat by an upward sweep above the sills. Around the back, the new A8 sports a thin strip of dark-tinted, possibly wraparound, tail-lights.
Last month, Rupert Stadler, Audi's chairman, confirmed that the new A8 will make its debut in 2017 and will feature Traffic Jam Pilot, Audi's new semi-autonomous driving system that can pilot the car on a motorway at speeds up to 60km/h.
The engine line-up for the new A8 will likely include V6, V8 and W12 petrol engines, along with V6 and V8 turbo-diesels. These will be joined later by a plug-in hybrid drivetrain.