Fixed most of the issues I was having but, annoyingly, introduced a pretty big one: Before the upgrade, syncing with BMW car kits was a bit "hit and miss" and apparently depended on the version of the iDrive software, etc, on the BMW.
I was one of the "lucky" ones, and my phone's contact list synced fine with my car. Unfortunately, after the 2.1 update the contact syncing to my car is now broken 🙁