Nintendo of America has announced that a Splatoon 2 tournament is coming to E3 2017! Not a whole lot of other details were announced at this time, other than the fact that this will be a pre-release tournament.
— Nintendo of America (@NintendoAmerica) April 25, 2017
Splatoon 2 launches in North America on July 21st. Stay tuned for more details as they become available.