If you use any of the smartphones listed above, then, be ready to receive an OTA update through the Updater app. You can still perform a manual flashing. All links available at the source below. Xiaomi has promised that after this first batch of devices, more models will start receiving the update.
The second part of the staged roll-out will start on February 20 and include the following smartphones: Redmi 2, Redmi 2 Prime, Redmi Note 3 Qualcomm, Redmi Note 3 Special Edition,, Redmi Note 2, Redmi Note Prime, Mi 2/2S, Mi 5, Mi 5s, Mi 5s Plus, Redmi 3/Prime, Redmi 3S/Prime and Redmi Note 4.
Coming to the Change-log, there’s an improved layout for the notification shade, some lockscreen and notification visual tweaks, as well as brand new system sounds and ringtones.
Aside from cosmetic changes, there are some new features, as well. Users can now take full control of the built-in automated tasks feature. Also, the OS will now do an antivirus scan when installing apps outside of the PlayStore.
Source: MIUI