When speaking about updates Xiaomi has always disappointed its users. The current latest version of Android is Android 7 Nougat, but most of the Xiaomi devices still run on Android 5.1 Lollipop. Only few devices like Redmi Note 3, Redmi Note 4, Redmi 4 Prime, Mi 5, Mi Note 2 and Mi Mix etc. are updated to Android 6 Marshmallow based on MIUI 8. So, we can expect Android 7.0 Nougat firmware update for these devices.
Recently an Image with Chinese writing with Android N text and some Xiaomi device models spreading the internet. Xiaomi has stated that these are the devices for which the Android N update is tested. The image included Android 7.0 supported devices named Mi Max, Mi 5, Mi 5s, Mi 5s Plus, Mi 4c, Mi 4s, Mi Note 2, Mi Note, Mi Mix and Mi Note 4X.
The image also shows devices tested with Android 7.1 Nougat firmware and they are Mi 6, Mi Max 2 and Mi 5c and Mi 4x.
So, for these device we can expect Android N update very soon may be in the form of MIUI 9. Make a note that more devices will also upgraded to Android N update and the device list is not final yet.
So, take a deep breath and wait for the Xiaomi to add flavours of Android 7 Nougat firmware to their devices.