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BMW has unveiled the 5 Series Gran Turismo concept, inventing categories that don't yet exist with a vehicle that isn't quite a sedan, wagon, crossover or SUV. Instead, the Bavarian automaker refers to its new vehicle as a Progressive Activity Sedan, which apparently means that it's a fastback wagon that sits a bit higher off the ground than normal sedans. If you love the shape of the X6 but don't need the ground clearance, you'll probably find little to complain about from the 5 Series GT.

The GT is a big car - larger than the 5-Series in every dimension. It measures 4.998 mm (197-inches) in length 1.901 mm (74.8-inches) in width and 1.559 mm (61.4-inches) in height with a limo-like 3.070 mm (120.9-inches) wheelbase. BMW 5-series Gran Turismo Concept PAS Open the pillarless doors and you'll find a four-seat layout and a panorama glass roof with BMW promising that the GT offers the passengers at the rear the same legroom as in the BMW 7 Series and virtually the same headroom as in the X5 SUV.

While we're not quite sure we're on board with the new bodystyle, one feature we do admire is the two-piece, double-jointed tailgate. It's a clever take on the classic problem of how to access the rear hatch in tight quarters. Once open, that space can hold a cavernous 58 cubic feet of stuff with the rear seats folded down. Regardless of the total amount of room, we've got to wonder if that oddly shaped opening will severely limit what can fit in the boot.

BMW did not release any mechanical details on the 5-Series GT that will make its first public appearance at the forthcoming Geneva Motor Show in early March.