I’m honestly not sure why they’ve given the game such a long subtitle. It was already a tongue twister to begin with and most people know what PlayerUnknown’s Battlegrounds is with the game being the biggest success story of 2017 (and potentially the last few years).
The rating doesn’t reveal a whole lot apart from the fact that it’s only been rated for Xbox One. The rating also suggests that maybe it is coming later this year (or potentially even next year). We’ve played the game at several Xbox events now and it seems to be running quite well.