BMW is making this way too complicated.
All they need to do is make a cradle with the right form factor, and license Apple's signal converter chip (which they have to do anyway) to do the lightning to USB conversion - just like with their $20 lightning to usb cable.
That's all it takes. Everything works except for "plugin" which uses the video out and is worthless anyway because it's such a terrible interface and we're all back in business without having to wait 7 months... because in 11 months the iPhone 5s or 6 or whatever will be out anyway.
If there are any quick moving businessmen out there, that's all you have to do. Make a plastic cradle that fits in the snap-in adapter, license the chip and you'll have every BMW owner out there buying your cradle for $50-$100 easy. (Note: give me a free one for showing you this idea).