As highlighted by dataminer and Splatoon 3 enthusiast 'OatmealDome' on social media, the next version is expected to drop in a few days. As noted by Nintendo's official Splatoon account, this update will revamp 'Undertow Spillway':
Nintendo: An important message from the Undertow Spillway maintenance team: "Undertow Spillway will be closed from 4/15 at 5pm to 4/17 at 7pm for inspections and expansion work. For safety reasons, access will be closed during this period so we appreciate your patience."
This fresh new update will follow Version 7.1.0, which splashed onto Switch towards the end of March. It included some fixes, the DLC Side Order, some SplatNet 3 updates, and much more. Last week, Nintendo also shut down the network services for Wii U and 3DS which saw the end of the online play for the original Splatoon game.