MIUI has been rebuilt and redesigned from scratch to result MIUI 8. Some features of the about-to-be-released MIUI 8 include: new fonts, lock screen, redesigned theme store, rebuilt Settings page, and lots of other cool features.
MIUI 8 will first arrive on some devices in Public Beta state, after which the Global Stable version will be released days later. The devices to first receive the Global Public Beta include:
Devices to receive MIUI 8 Public Beta
Mi 2/2S, Mi 3, Mi 4, Mi 4i, Mi 5, Mi Note, Mi Max 32GB, Redmi 1S, Redmi 2, Redmi 2 Prime, Redmi Note 3G, Redmi Note 4G, Redmi Note Prime, Redmi Note 2, Redmi Note 3 Qualcomm