"Link your Nintendo account" option on Black Ops 3 website

[Skullwaker]

Dr.Vita said:
The Vita Call of Duty sold 1.21M

The 2 Wii U Call of Duty's sold TOGETHER 540k. 
The PS Vita Call of Duty sold twice as much of the both Wii U Call of Duty's together!

Yes, but the Wii U games only had to cover the cost of porting, while Declassified had to cover the entire cost of developing/marketing/etc. since it was an exclusive title. 

It makes more sense to put BLOPS 3 in particular on Wii U, considering it's Treyarch developing the game so it should sell more than the previous Wii U games. For reference, BLOPS 2 sold more than Ghosts despite being a launch title. Because it was actually a quality port. Now that the Wii U has a larger and more active install base, BLOPS 3 should sell more.