List of post-release content in Splatoon 2

Post-release content is additional content released for after the game's release date. Nintendo frequently releases new weapons, stages, modes, features, and gear. Usually, Nintendo announces the release date of upcoming content via their social media accounts. An in-game news announcement introduces the new content when it has been released. Interestingly, most additional content is already in Splatoon 2, waiting to be unlocked by Nintendo. Nintendo has claimed that new content will continue to be released for "about a year".

My Nintendo rewards program
At least four gear items are planned for release through the My Nintendo rewards program in 2018. All of this gear is currently Japan-exclusive, so release through the rewards program could mean worldwide availability.

Squid Fashion Contest 2017
In a July 2017 issue, the magazine held the Squid Fashion Contest 2017, which allowed readers to submit gear designs for a chance at having the design added to Splatoon 2. The winning design, called Ghillie Suit Style, will eventually be added to the game. Squid Fashion Contest 2017 also allowed the submission of graffiti. The winning design, Noshi Ika Graffiti, will be added to the game in an upcoming update.

Weapons found in game files
Nintendo adds weapons to the game before unlocking them. The following upcoming weapons have been found in the game's files.

CoroCoro gear
The CoroCoro magazine has announced the release of the "Emperor Gear set". In order to obtain it, players must get a unique download code from the December 2017 issue of CoroCoro magazine.