The ROM comes courtesy of XDA Developers' senior member GLokin666, but at this point it's nowhere near stable.
Noteworthy issues are non-functional fingerprint scanners and infrared blasters. The camera on the Redmi Note 4 isn't stable under the Android One ROM as well.
Still if you'd like to get a taste of Android One - follow the source link below.
They don't ask for that much, just a phone number. Others mine for data much much more aggressively.
But we dont have to beg to xiaomi, and give all our personal details to unlock bootloader in A1.
Nice idea, but hopefully it will be more stable (eventually).