From Inkipedia, the Splatoon wiki
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Even if it appears unused, this category should not be deleted.
Reason: Potentially clear category.

The category should contain content that is not currently available but has been confirmed to be released in the future.

Unconfirmed content should be tagged with {{leak}} instead.

Content that has been released past initial release should be documented in post-release content.

Articles may be included in this category by the addition of {{future}}.