Splatoon 2 Pre-Orders in Japan have sky rocketed through the rough. With 800K stand alone copies of the game being pre-ordered there. This is not counting worldwide sales, or even the Switch and Spaltoon 2 Bundles in Japan. It seems that Nintendo has a huge title on their hands that has generated a lot of positive buzz. You can find the figures on COMG to see how it compares sales wise.
Splatoon 2 has approximately 800k preorders in Japan (maybe more, maybe less). In a single day should be top selling Switch game in Japan.
— Stealth (@Stealth___) July 2, 2017