Update: Now working – Mario Party 2 missing its Wii U upgrade discount on the North American eShop
Update (12/23): The discount is now in place, so you should find that the $2 discount upgrade is live.
Original (12/22): Mario Party 2 launched on Wii U today, though this isn’t the first time the game has seen a Virtual Console release. It also came out on Wii many years ago. Of course, that means those who purchased the original Virtual Console version should be entitled to a $2 upgrade price on Wii U instead of the full $10. But unfortunately, it’s not showing up currently.
Zelda: Majora’s Mask went through something similar a few weeks ago. Soon after the issue was reported, Nintendo corrected the problem. I imagine that will be the case here as well.