A really good tvOS 10 Wishlist here:
Slow motion playback
The previous Apple TV software supported slow motion playback but this feature was removed in the Apple TV 4 upgrade. Apple should add this functionality back when using the Siri remote.
Picture in Picture and, possibly, Split View
Users love Picture in Picture, introduced for iPad with iOS 9. If Apple could somehow deliver this to Apple TV, allowing us to view a Netflix movie whilst playing a game, for example, it would be really neat. More of a long-shot, but Split View apps would be neat on the TV too.
Dark Mode
The new tvOS interface is beautiful. The dynamic icons which subtly move with motion, the smooth animations and the gorgeous sound effects are just a joy to experience. One complaint many users have though is the sheer brightness of the display, especially at night time. One online commenter described it as being akin to seeing an atom bomb explode on their cinema screen in their house. I would advocate a Dark Mode which enables at sunset automatically, which uses dark backgrounds instead of light throughout the OS.
—
Full list:
tvOS 10 Wishlist
What do you want to see in tvOS 10? I particularly would like a Dark Mode, Safari and the Universal Watch List.