Here is the latest BMW Bluetooth Update just released in the last 24 hours. Install using USB. This is version UPD01005. But it did not help for the IOS6 problem as far as I can tell in regards to the emails not showing up in iDrive.
The PDF says its still only for IOS 5?
So it will be a Apple IOS 6 update to fix the problem.
X5 M50d White, 20"rims, Adaptive Drive, HUD, Xenon Adapt Lights, Rear/Side Camera, Sunroof, Auto Tailgate, Comfort Access, Active Perforated Ventilated Comfort Seats, M Paddle Shift, Active Crus, Stop/Go, Proff Nav + TV, DAB, 16 Spk Ind HiFi, USB, Internet, Apps, 4 Zone Air, Towbar 20% Tint, 5mm Castor Bushes, Yellow Calipers, Ceramic Pads