I haven't had any problems pairing my iPhone 5 to my 2013 550i. I do have 2 annoyances though. Notifications work as does bluetooth audio streaming and calling. I do have 2 annoyances that I hope will be addressed at some point.
1) Email notifications work, but require that you change the number of messages you are able to view on the phone each time you start the car.
2) Plugging in the phone to USB automatically disables the bluetooth streaming audio and you have to reactivate it.