Release dates, confirmed by Nintendo:

DS
3/29 – More English Training
3/12 – Mario vs Donkey Kong 2
4/19 – International Daredemo Asobi Taizen
4/19 – Nodame Canterbilly
4/26 – Panel de Pon

Wii
4/19 Super Paper Mario
4/26 Yawaraka Atamajuku (Big Brain Academy)
4/26 One Piece Unlimited Adventure

Nothing to exciting yet, but there is a lot more on the horizon.

Source: infendo