Pioneer AppRadio users should think twice before upgrading to iOS 8. There are problems with the in-app keyboard, general compatibility and display issues with AppRadio Mode apps. Therefore Pioneer suggests not updating to iOS 8 if you are using AppRadio apps in your car.
No iOS 8.0-8.2 Bluetooth issues with Pioneer iPhone 5/5c/5S/6/6+ or CarPlay
AUTO Connected Car News has been tracking Bluetooth issues with iOS 8.0 -8.02 (iPhone 5-6+) and many in-car infotainment systems. Pioneer has some iOS 8