I am thinking about getting one as well. I think there will be the same issue as Smartphones and other PPC's. The phone will work but you will not get the address book transfer. This will continue to be an issue until MS stops using their own BT stack and starts using the Widcomm stack.

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2011 550xi Carbon Black/Oyster, M-Sport, Premium Package, Technology Package, Electronic Damper Control, Dynamic Drive, Comfort Access, Active Seats, Surround Cameras

2013 X5 5.0 Space Grey/Black, M-Sport, Premium Package, Technology Package, Comfort Access, Surround Cameras