I agree. Ios8.1 has not fixed Bluetooth issues whch cause disconnection occurring and location services to disconnect from the app.
All other Bluetooth issues with my car are now fixed.
That being said, it could still be on Apples side, but it could also be that firmware or App changes need to happen to make it fully compatible with iPhone 6 and iOS.
After all, As part of any Apple changes, Apps need to get updated to fully work with these changes, all developers acknowledge this, and possible this also applies to firmware