I think apple will release split screen multitasking on the iPhone , but just with the 5.5 inch 7+ or the rumored 5.8 inch iPhone pro?
I would love the iPad Pro to have a simple file manager in iOS 10. and use the same screen as the split screen app selector, to choose with which app you can open a file in the file manager .
But what I want most in the future, perhaps iOS 11, is a way to use an arm based Mac OS on the iPad Pro . When a keyboard is added through smartconnector, you get a choice of working in iOS or MacOs mode.
Without keyboard you can only select iOS.
But they should develop a keyboard cover with a trackpad then. And perhaps even a keyboard cover with additional hw inside to make it more powerful and work in parallel through smart connector with the iPad hardware to get a more powerful machine.(dual a11x?)