I am guessing it'll be sold out for a long time like WiiFit.
And that means we'll see price jacked up, way up, on ebay and such.
What's your prediction on how much people are willing to pay for?
AFAIK, WM+ addon is retailing for $20 USD.
Now, it would be silly to create a prediction thread without having my own.
I am going to go with average of ~$50 USD for the first 6 months and continue that way until Nintendo produce enough to kill of the shortages.