The global beta of Xiaomi's custom ROM based on Android Nougat is now finally rolling out to three handsets, but a second (and larger) batch of devices scheduled to get the new firmware has been announced as well.
https://www.notebookcheck.net/MIUI-9-global-beta-hits-Xiaomi-Mi-6-and-Redmi-Note-4-4X-handsets.241086.0.html