BMW first revealed that its X6 SUV would be available as a hybrid model when it rolled out the X6 ActiveHybrid concept vehicle at last year's Frankfurt Motor Show. The car has since been spotted testing in prototype form on both sides of the Atlantic and these latest spy images reveal a near-production ready version of the upcoming model. Previous prototypes were seen sporting an oversized bulge on the bonnet, most likely to accommodate the new hybrid hardware. The latest prototype looks much more like the standard X6, although a small bump remains. The new hybrid will feature BMW's version of the modular two-mode hybrid system jointly developed with Daimler and General Motors and is expected to improve fuel efficiency by about 20% when compared to the xDrive50i V8 model. The design uses twin electric motors which can either be used to boost acceleration, charge the batteries or as a generator to mutually power each other.