Nokia 2 running on the stable Android Nougat has started receiving a major update which is big at 567MB in size and is not just the Security patch release. As per the changelog, the update brings System Stability improvements along with Google's October 2018 Android Security update.
Nokia 2 users in India are receiving the update and if you haven't received the update notification you should manually check for the update by going to Settings > About Phone > System Updates. You can learn more about the October security patch on Android Security Bulletin.
Currently, Nokia Mobile is testing the Android Oreo Beta for Nokia 2 via Beta Labs and the stable Android Oreo should be rolled out very soon. We assume that this new update is in preparation for the release of the stable Android Oreo update for Nokia 2 which should be released soon. Stay tuned to know when the official Android Oreo update hits the Nokia 2. ☺️