Just a small thing that i would have liked in iOS 9 is Handoff which will show directly the app that i'll be moved to on the lockscreen.
Let's say that I'm watching some Youtube video and i want to swich to my phone. When I do that, as I already have the Youtube app, it will bring me to the app, but still from Safari to the app.
It will be nice if on the Lockscreen I see the actual app icon, then directly go to and when I'm watching my video started on my mac I'll not have a « Back to Safari » link
I also hope that once with the Unified Membership, we'll see more mac apps 😀