These are the featured Ranked Battle stages for June. Eight stages are available in each mode, and two out of eight stages will be playable in a given two-hour rotation.
— 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. 😀