You HTC One users are waiting ever so patiently for that Android 4.2.2 update, and those of you on an unlocked international version in Northern Europe will be glad to hear that the update has hit a few countries in that region. Russia, Denmark, Norway, Hungary, Romania, Serbia, Sweden, and Finland are the lucky countries to start receiving the OTA update. So check in your system settings to see if the update has made its way in your phone already. We will be sure to let you US users know when the update will begin to roll out.
Source: Android and Me