List of post-release content in Splatoon

From Inkipedia, the Splatoon wiki

Downloadable Content, or DLC, is additional post-launch content released for Splatoon. Nintendo of America's official Twitter has stated that "Every week or two, new free content will be introduced in #Splatoon, including weapons, stages and gear."

Existing DLC

Weapons

N-Zap '85

File:N Zap 85.jpg
The N-Zap '85

The N-Zap '85 is a shooter-type weapon released on June 1st, 2015. It is very similar in stats to the Splattershot Jr., but lacks its range. It's sub weapon is the Splat Bombs, and it's special weapon is the Echolocator. To unlock this weapon, one must reach level 5, and pay 3,500 coins.

Inkbrush

The Inkbrush is a Roller type weapon that has thinner Ink coverage than its Splat Roller and Dynamo Roller siblings, but allows the player to move significantly faster. It was released on June 5th, 2015.

File:PortMackerel.jpg
Port Mackerel

Stages

Port Mackerel

The Inkbrush in action

Port Mackerel is a stage released on June 1st, 2015. Like majority of the other maps, it is symmetrical, and like Kelp Dome it has multiple isles.

Modes

Ranked Battle

Ranked Battle is a mode that was released on June 1st, 2015. It allow two teams to fight for control of predetermined locations on a stage.

Upcoming DLC

Weapons

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Game Modes

Tower Control

Tower Control is a Capture the Flag Style game mode that will be released post-launch, presumably before August.

Tower Control gameplay

Rainmaker

Virtually nothing has been revealed of the Rainmaker mode other than its name.

Other

August Update Event

This August, a "huge matchmaking update" is expected. This will add a slew of new matchmaking features, including friend-based matchmaking. This will allow either 4 Wii U friends to team up against another group of 4 Wii U friends, or allow 8 Wii U friends to secure a lobby for themselves, where the group will be able to decide the stage and ruleset.