Nintendo only started the marketing 1~2 weeks ago, so the marketing push is not bigger than say, mario 3D world. Besides, nintendo stuff generally don't have a great start and them drop like a rock. They even said that they intend to market the game the whole year, So, don't expect a huge difference on first month. Rather, expect it to appear on top 10 every slow week in some areas of the globe.
But yeah, 700K people will buy it only for this game, just not on the first month.
"Hardware design isn’t about making the most powerful thing you can.
Today most hardware design is left to other companies, but when you make hardware without taking into account the needs of the eventual software developers, you end up with bloated hardware full of pointless excess. From the outset one must consider design from both a hardware and software perspective."
Gunpei Yoko
