Splatoon 2 is getting an update that includes new weapon sets, Splatfest changes, and additional sub and special weapons.
Ver. 4's changes kick off tonight with the addition of new weapon sets part of the Kensa Collection. New sub and special weapons, as well as fresh features to Splatfest events will be implemented soon.
No other information was immediately released
[Source: Splatoon on Tumblr]