Soundwave on 03 July 2016
March is not a great time to launch, but it is what it is at this point, they missed the holiday season but they can't afford to have a third bad launch in a row (3DS and Wii U prior to this, in fact DS launch wasn't great either, Wii was good but mainly because they took Zelda from the GameCube).
I think at least there is Golden Week there in April/May in Japan and they want that period, maybe they could have Splatoon 1.5 or even Splatoon 2 ready by that time (the first Splatoon would be 2 years old by that point).
