How about going back to the Jobs-era trend of innovating instead of copying Microsoft and Google? Specifically, I mean how about going back to the iOS 6 fonts and skeuomorphic design instead of continuing to copy Microsoft and Google's implementation of thin fonts and flat design?
What exactly is innovative about skeuomorphism? Apple was being left behind. In some cases they still are behind. Siri should be leapfrogging ahead of Google now and Cortana. Where is the third-party API for Siri? Maps still need lots of improvement. How about moving away from an app centric pull model to more of a push model that feeds me contextually relevant information rather than me having to go search for it app by app. I think the Watch will force Apple to do some of these things. I want Apple's version of Google Now on the Watch. I'm hoping some of that comes to iOS. Complications on the lock screen would be awesome. I'd love force touch with control center so I don't have to navigate to the settings app to change a Bluetooth or Wi-Fi connection. Or how about just more customization of control center in general so I can decide those things that are most important to have quick access to? Oh and I haven't even talked about iOS on the iPad. LOTS of room for improvement there.