Apple 4K TV is Apple's newest TV assistant with 4K video & HDR support, with a suite of television, movies, games, sports, and news programming.
tvOS 12 is Apple's newest iteration of the Apple TV software. 📺
Xiaomi just announced Mi Box S, its latest 4K box powered by Android TV. It runs Android TV 8.1, comes with voice remote with Netflix shortcut, Assistant button, app shortcut and supports Google Assistant for easy voice search, and has built-in Chromecast. It also comes with 4K HDR support.