Dates and prices.
April 3
Advance Wars (Wii U, $7.99)
Mario & Luigi: Superstar Saga (Wii U, $7.99)
Metroid Fusion (Wii U, $7.99)
April 10
Kirby & The Amazing Mirror (Wii U, $6.99)
WarioWare, Inc.: Mega Microgame$!
April 17
Super Mario Bros. 3(NES) (Wii U and Nintendo 3DS, $4.99)
F-Zero: Maximum Velocity (Wii U, $6.99)
Golden Sun (Wii U, $7.99)
April 24
Yoshi's Island: Super Mario Advance 3 (Wii U, $7.99)
EDIT: Also, all games confirmed single-player only.