420k.
My initial thought - "at least 4 times bigger than the Pikmin 3 launch"
Tracking ahead of MK7 in terms of pre-orders. The WiiU isn't far off to where the 3DS was in hardware sales at the time. Even though this is Japan, console MK is always a bigger draw than a handheld one.
Hype!
I predict NX launches in 2017 - not 2016