Based on rumours, they've already got it all lined up.
Mario Kart (sold over 33 million on Wii)
Wii Fit U (sold somewhere between 23 and 44 million on Wii)
3D Mario (sold around 11 million and then 7 million on Wii)
Zelda (Wind Waker HD) (sold 7 million and then 4 million on Wii)
and from vaguer rumour,
Wii Sports U (sold 32 million even with the mostly non-bundled version, Resort, on Wii)