Here is the list of Xiaomi supported phones, and roll-out timeline

Phase 1 (June end)

Mi 9T
Mi 9T Pro
Redmi K20
Redmi K20 Pro

Phase 2 (TBA)

Redmi Note 7, Redmi Note 7 Pro, Redmi Note 8 Pro, Redmi Note 9, POCO F1, Mi 10 Pro, Mi 10, POCO F2 Pro, POCO X2, Mi 10 Lite, Mi Note 10, Mi 8, Mi 8 Pro, Mi MIX 3, Mi MIX 2S, Mi 9 SE, Mi 9 Lite, Redmi Note 7S, Mi Note 3, Mi MIX 2, Mi MAX 3, Mi 8 Lite, Redmi Y2, Redmi S2, Redmi Note 5, Redmi Note 5 Pro, Redmi 6A, Redmi 6, Redmi 6 Pro, Redmi Note 6 Pro, Redmi Y3, Redmi 7, Redmi 7A, Redmi Note 8, Redmi Note 8T, Redmi 8, Redmi 8A, Redmi 8A Dual, Redmi Note 9s, Redmi Note 9 Pro, Redmi Note 9 Pro Max, Mi Note 10 Lite.

We introduced floating windows to enable perfect multitasking on phones. Now you don’t have to switch between apps when you’re multitasking a few things on your phone. You can open and close a window in a single tap. #MIUI12 #DecadesMasterpiece pic.twitter.com/6eUqOf7r4f

— MIUI (@miuirom) May 19, 2020

Health

Xiaomi with its fitness app used to let users monitor exercises, walking running, cycling and more. The company is now expanding MIUI’s health capabilities with the launch of MIUI 12. The company states that devices running MIUI 12 will be able to track user’s REM sleep. It will store all of the data on the device itself.

Improved Dark Mode

Dark Mode was introduced with MIUI 11, the company now claims to have improved it a lot. It has added a wallpaper dimming feature, that simulates the gradual light transition from day to night on the wallpaper. MIUI 12 adjusts the font based on whether it is a light mode or dark mode. Lastly, all the system apps and a few other apps will now support the system dark mode natively.

Note: Some of these features like new animations in Always On Display due to hardware limitations, will only be made available for Xiaomi devices with AMOLED displays.