In addition to the ports I would like to see...Wii U most definately needs GameCube on Virtual Console with enhanced motion control. The Pikmin games were made for motion controls...not to mention Super Monkey Ball 1 & 2. Super Mario Sunshine, Luigi's Mansion, The Legend of Zelda: Wind Waker, and a better controlled Mario Power Tennis. Mario Kart Double Dash!! could support motion controls in the 1-player mode.
Other than those, I would also like to play Paper Mario 2, Star Fox Adventures, Soul Calibur II, F-Zero GX, Icaruga, Super Smash Bros. Melee, Wario World, and other good GCN titles.