For those unaware, Splatoon 2 has a manga currently going that somehow ties in with the game's plot. I guess it has been popular enough to receive an anime adaptation, because that is exactly what's happening. CoroCoro Comic, the publishers behind the manga, announced that a new series is in the works to be launched on their YouTube channel in the near future.
The series will debut on August 12, though there isn't any confirmation of English subtitles. I wouldn't be surprised if fans get some subs up within days of release, but just note that non-Japanese speaking audiences probably won't be watching it immediately. You could learn Japanese in the next month, but that seems a bit more difficult than just waiting.
Splatoon Anime Announced Based on the Manga [Rice Digital]