Splatoon 2 is getting a massive update this week complete which will add new gear, music, weapons, and stages, a new rank, and more!
On April 25 the previously announced Splatoon 2 Version 3.0.0 update will be available for all players, and it brings the introduction of the X Rank, which will challenge the top players in Ranked Battle.
Players who are S+10 in the current Splatoon 2 rankings will automatically be registered as X Rank after the update. X Rank players will fight for an X Power level, and will be matched with other X Rank players with similar Power levels.
Source : IGN.com