https://www.gamespot.com/articles/splatoon-2s-latest-stage-and-weapon-are-available-/1100-6453853/

The squid research lab is back at it again to keep the freshest Switch game up and running. Splatoon 2's latest free update will include the Snapper Canal map and a returning weapon from the original Splatoon, the Bamboozler 14 Mk 1.

The Snapper Canal map was revealed just recently in the latest Nintendo Direct. Nintendo of Europe tweeted out some images, showing off the map's massive bridges and river running straight through the middle. This map is already available in game at the time of publication.