Styling will obviously feature minor updates and it looks like the X6 will get the new BMW sidevent behind the front wheels that is becoming a staple of the design of the next generation cars. The real important changes are under the skin though.
The shot of the interior shows what appears to be a DCT shift knob (with the M DCT symbol covered up) and shift paddles behind the steering wheel. The current X6M uses an automatic transmission so the change to a dual clutch will elevate the X6M's performance although it will be interesting to see how this affects towing capability. It is still supposed to offer some utility isn't it?
With the updated S63TU out of the M5 or some software changes to the S63 it currently has combined with some weight loss (roughly 200 pounds like the F15 X5) the new X6M should raise its performance level considerably and above its rivals. Porsche does not offer a dual clutch transmission in the Cayenne Turbo and neither does Mercedes in the ML63 AMG. BMW may be ahead of the curve here.