TechnoHobbit on 15 September 2014
It won't be a system seller in the sense of it being a killer app, but it will sell a number of Wii U units (I'm guessing around a 30k bump all launches aligned).
As for software I'd say it could possibly reach 1 million lifetime, but 800k is more likely.
Bets:
1. If the Wii U sells closer to 10 million LTD by 1/3/2015 I win. If it sells closer to 9.5 million LTD by 1/3/2015 OfficerRaichu15 wins (winner gets 2 weeks of avatar control)--Lost.
