Since there is left few days [weeks/months] till Pie's release on Nokia 6. So I'll try to put together here all information about upcoming release.
We know that Nokia 6 will get upgrade on Android 9 in Quarter 1st of 2019
In January 24th there was announce that Nokia 5 (2017) has just been updated to Android 9 Pie!
༼ つ ◕_◕ ༽つ