The BMW X6 remains something of an enigma, specifically, why does it exist? Nonetheless, it does and BMW is working on additional variants including a two-mode hybrid for release later this year and an M version. We don't have much detail yet on the X6 M, but BMW has put a video up on YouTube with Bernd Limmer from M GmbH demonstrating a prototype. The X6 M will evidently have a higher output version of the current twin turbo V8, probably hitting the magic 500 hp mark. The xDrive all-wheel-drive system is also being re-jiggered to send more torque to the rear axle. That should help reduce the understeer that the nose heavy V8 X6's are prone to. So far there is no word on when we will see the X6 M in the flesh, but either the Geneva Motor Show in March or Frankfurt Motor Show in September seem's likely. Follow the jump to see the X6 M for yourself in high-res video. Thanks to xeyad for the tip!