I am quite shocked how bad iOS 8.4 (especially Safari and the new Music app) runs on the iPad Air 2. I mean: Hello?!? This is by far the most powerful iOS-device yet! On the iPhone 6 however I feel it runs quite good...
Just my thoughts.
I don' believe there will be another iOS-8-update like 8.4.1 or something. All iOS-devs now focusing on iOS 9! That's it for iOS 8!(...) Hopefully they release an update soon.
Just my thoughts.