I have been following this thread with great interest. So what you're saying is that the new iDrive controller (with individual buttons) will work with the old (07 to LCI) iDrive system? Do I need to purchase a new wiring harness to mate the new controller to the old system or will the existing harness be fine. Thanks for your informative input so far.
E92 M3 2007 - ///PE with Test Pipes and BPM Stage II; CF Interior & Splitters; CIC with Connected Drive