Am I the only one who thinks that this should've been a new Wario Land game, instead? It would've fit in with the gold coin collecting theme more. Also they could've added Waluigi to the game.
If you have a MyNintendo account, purchases done on the eShop and on WiiWare are logged on that profile. I wouldn't be surprised if Wii U accounts were binded to this account in the future in fact.