In the next few hours you might be able to download MIUI 8.0 on your device as OTA (Over The Air) update. All the Xiaomi devices are not getting the update at the same time. Xiaomi rolling out the update in a phased manner.
Redmi 1S, Mi 2/2S, Mi 4i, Redmi Note 3G, Redmi Note 4G will get the update immediately. MIUI 8.0 for the other Xiaomi devices will be available soon. The latest operating system has announced along with the Mi Max phablet in July 2016. Later Xiaomi released the beta version for selected users.
Earlier the operating system stable version has expected to launch on 15th August. But it was delayed for a week and at last it arrived today. MIUI 8.0 consists a major design overhaul with plenty of new features.