☆ NintendObs Weekly – Monday, August 27, 2018 – Sunday, September 2, 2018.
A preview of what’s to come! These are the featured Ranked Battle stages available for September. There will be eight stages available in each mode, and two out of eight stages will be playable in each two-hour rotation. Starfish Mainstage will become available as soon as the construction work is finished.
— Squid Research Lab
Source: Splatoon’s Tumblr.
…Wanna play? Buy a Switch.
And if you’ve already got yours, click on Splatoon 2 for everything you need to know about the game. 😀