Audi's Sportback concept, which previews the A7 and hints at the manufacturer's new styling direction, is a star attraction at the Detroit Motor Show.Set to roll into production as the A7 later this year, Audi considers this five-door, with its coupe-like profile and rear hatch, to be a bold step forward in the luxury segment. The production model will be positioned beneath the flagship A8 sedan.This Sportback concept, like the A5 coupe, uses the same platform as the new A4.Taking several cues from the A5 coupe too (the shoulder line and rear light clusters are particularly familiar), this concept also offers a new interpretation of the signature Audi grille. Losing the vertical struts gives the single-frame a more athletic appearance.LATEST DIESELA fresh interior feature is the retractable MMI display. Once the ignition is activated, the screen extends from a slot within the dash into a vertical position. As far as its drivetrain is concerned, the show car is powered by the latest generation three-litre V6 TDI which produces 165kW and 550Nm of torque. The engine, said to be one of the world's most progressive diesel engines, has a system to significantly reduce nitrogen oxides. Other highlights are combustion chamber sensors that allow more precise combustion.Permanent all-wheel drive is another feature and drive to the four wheels is through Audi's new seven-speed S tronic dual clutch transmission.The show car is claimed to return a fuel consumption figure of 5.9 litres/100 km.