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.
http://www.bmw.com/bluetooth
The PDF says its still only for IOS 5?
So it will be a Apple IOS 6 update to fix the problem.