At the North American International Auto Show in Detroit, USA, Volkswagen has an impressive study vehicle on display: the Advanced Activity Concept (AAC). It combines the functions of a pick-up with the luxury of a top-class sedan. With four-wheel drive, and powered by a 230 kW (313 hp) V10 TDI diesel engine, this is an initial clue to the changes that could take place in this vehicle class within a very short time.