Suomimobiili reports that Nokia 6 started receiving the latest version of the Android, 7.1.2 via an OTA updateThe size of this update is 664.5 MB. It is also followed by the latest security update which is nice to hear. It seems that right now the update is just available for the TA-1021 since for our TA-1033 Nokia 6 is still not available. For Chinese TA-1000 and TA-1003, the update contains just the October patch.
To check for the availability of the update go to Settings>About Phone>System Updates.