THE Audi Q8 concept has been unveiled at the Detroit Motor Show, hinting at a smart-looking, hybrid engined fastback SUV that will one day challenge the Mercedes-Benz GLE Coupe and BMW X6.

The Audi Q7-based concept is likely to spin into a production model expected in 2018. The 5020mm long Toyota Prado-sized Bombay blue luxury cruiser includes a striking exterior with bold octagonal grille and sloping roofline; a “luxury lounge” cabin for four people, virtual cockpit technology and a plug-in hybrid system producing 330kW/700Nm.

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Twenty-inch ceramic brake discs wrapped in Y-spoked 23-inch rims help bring it to a halt.

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The Q8 Concept’s 3000mm wheelbase means its footprint is more stretched than a Range Rover’s, but a relatively low 1700mm roofline and high wheel arches give it a taut appearance belying its considerable size.

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Adding to the sleek exterior is the lack of door handles, replaced with touch sensors that automatically open the doors to a defined angle.

Inside, the four-seat interior features Nappa and Nabuk leather and a yacht-like centre console enhanced with a large shift-by-wire gearstick. Central control and display surfaces are integrated into a so-called “black panel” that merges the interior with the display.

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While the Audi Q8 Concept isn’t exactly about practicality, Audi is keen to point out that boot space is 650 litres – that’s more than the BMW X6 and the same as Merc’s GLE Coupe.

Expect a toned-down version of the Audi Q8 Concept when the German carmaker reveals the production version already spotted wearing camouflage.

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Other engine options include the SQ7’s 325kW 4.0-litre V8 for a high-performance SQ8-badged spin-off.

It is expected to cost around the same as its Mercedes GLE Coupe and BMW X6 rivals, with an entry price of about $100,000.