The latest MIUI 8 that will be expected to roll out in August is available to have a test drive with MIUI 8 Global Beta ROM.
Current supported devices are; Mi 2/2S, Mi 3, Mi 4, Mi 4i Mi 5, Mi Note/Note Prime, Redmi 1S, Redmi 2/2 Prime, Redmi Mi Max (32GB), Redmi Note 2, Redmi Note 3G/4G, and Redmi Note 3 (Qualcomm)
The new ROM bring major updates and improvements such as new design, a second space, dual app support (example two different WhatsApp account with Dual SIM), Long Screenshots, Redesigned Gallery, and much more.
Like the name it said, MIUI 8 is still a Beta ROM and do expect some hiccups but with the beta testers out there, I believe most of the issues will be able to ironed up promptly.
If you interest try out the MIUI 8 Global Beta ROM, head to MIUI Forum to get to know the update tutorial.