Xiaomi announced MIUI for TV 3.0 back in July and now it seems some users in China have started receiving the update. MIUI for TV 3.0 offers a new refined layout for the user interface, a selection of viewing modes, and dynamic animation effects that may be limited only to Xiaomi Master Series devices.
https://www.notebookcheck.net/Xiaomi-s-MIUI-for-TV-3-0-starts-rolling-out-bringing-a-clearer-UI-layout-and-nifty-dynamic-animations-with-it.495363.0.html