I updated my iPhone 5 to iOS 8.0.2 and no issues with my aftermarket head unit. Even when I installed 8.0 there were no issues. Also, I have a VIZIO Sound bar and no issues connection bluetooth either. 
My system connects via Lightning instead of Bluetooth, but I've also had trouble. Since I got my iPhone 6, whenever I connect the phone, I have to wait about ten seconds. I'll get a message that says "This device is incompatible with this iPhone." I then disconnect and reconnect it and it works after that. It's very bizarre.
No issues here with my Beemer.
Apple's online support has not been able to help me with this problem. In my iPad under Bluetooth I see two iPhone 6s. In my iPhone under Bluetooth I see two iPad airs. In each case I can only forget one device, the one that works.
As a huge Apple fan, I have to say this is the worst roll-out of products and services in the company's history. And right when they needed to blow the world away...
Ok. IOS 8 vs Vista...
More like iOS8 vs Windows ME.
Is strike 4 or 5? I forget.