Comprehensive wishlist here, calls for jump to 11.0 and MacOS name:
UIKit for Mac
This is quite a big one. If Apple released UIKit for Mac as an alternative to the traditional development, they could open up the floor to a whole new range of apps. Facebook could bring native clients for Facebook and Messenger; Netflix could port its iOS client for the Mac screen and so on. These apps would have their own UI conventions to be optimised for a pointer and keyboard, but share much of the same base as the iOS versions. It could really revolutionise the Mac App Store and be great for both developers and users.
Night Shift
A no-brainer, the blue light reduction feature of iOS 9.3 would be a worthy addition to the Mac platform. It would be toggled in Control Center and available on a sunset to sunrise option just like on iOS devices.
Night Mode which updates window chrome
The Dark menu bar and Dock option is as far as Apple went with a dark theme for the Mac OS. This year, it would be nice to see a proper Night Mode, tied to Night Shift. It would update window chrome, sidebars and toolbars and include an API for developers to hook into their apps.
Siri
This one is heavily rumoured for this year, and not without good reason. It’s madness the personal assistant is not on Mac yet. There are tons of useful queries we could ask the assistant which could range from searching to launching and quitting apps to simply restarting the machine.
Push notifications for Mail even when app shut
This one is a bit bizarre. The Mail app needs to be opened for Push notifications to arrive. In the next version of OS X, native push notifications while the app is shut would be super useful.
iTunes dismantled into Music, Podcasts, Videos, Books, Store and Sync apps
People have been crying out for this for some time and Apple are surely working toward a future where this is the case. It’s unlikely to happen this year but in my dreams, a dedicated Music library/streaming app, Podcasts app, Videos app, unified Store app (for apps and media) and a Sync app for device management would be the most intuitive and streamlined way to go.
Improved interfaces for iLife and iWork apps with collaboration features
iLife and iWork have become a little neglected. Apple would do good to improve their UIs (bringing back the optional floating inspectors, for example) and add collaboration features which are found on the iCloud versions to the desktop apps.
Weather, News, Health, Phone apps for Mac
[......]
—
Full wishlist here: http://www.theapplestream.com/os-x-10-12-wishlist/