The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per ign.com: "…— dubbed The Return of the Mammalians — starts in territory so familiar that I was initially worried…"
Release date: September 9, 2022[1]
Wikipedia's Splatoon 3 article describes the ink shooter's new weapons, Turf War and Anarchy Battles, three-team Splatfests with Tricolor Turf War, and Salmon Run Next Wave.
A 90,325-view Twitch clip of Splatoon 3 gameplay: evidence that the game is playable, not a source for the event or its date.
MobileSyrup confirms Nintendo[2] stated Splatoon 3 "is making its way to Nintendo Switch on September 9th," matching the pin's stored date exactly, though the article (published April 22, 2022) is the release-date announcement rather than the launch itself.
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A colorful online shooter available on Nintendo Switch at this launch.
SourceHistorically, Splatoon’s single-player campaigns have focused on acclimating you to the waters of its much more frantic and churning multiplayer battle modes. Splatoon 3’s campaign — dubbed The Return of the Mammalians — starts in territory so familiar that I was initially worried I was about to spend the next several hours slogging through tutorials on fundamentals I’d learned two games ago. Thankfully, the rug was quickly pulled out from under me, leading to a brand-new take on the series’ hub world design mixed with some of the best ideas of Splatoon 2’s Octo Expansion. Splatoon 3 boldly let me decide on whether or not to blaze my own path toward any of its 70 bite-sized, inventive missions, and choose where to go next when exploring its fuzzy ooze-filled world. A lot of the enemies I found there were unchanged from previous Splatoons, but I had a great time navigating the large variety of objectives all the way to the campaign’s explosively satisfying finale.