Audi has unveiled the third iteration of its prologue design concept - the allroad - at the Shanghai Auto show. The Estate variant features a raised body and a more rugged stance, with 22-inch wheels and flared arches. The hybrid show car is powered by a 4.0-litre TFSI V8 and an electric motor for a total system output of 734 bhp and 900 Nm of torque, which helps launch the allroad to 62mph in 3.5 seconds while returning up to 117mpg.