Megaman Xtreme, a re-making of the original Megaman X on SNES, has already kicked off this promotion.
Megaman Xtreme 5-1-14
Megaman II 5-8-14
Megaman III 5-8-14
Megaman IV 5-15-14
Megaman V 5-22-14
Megaman Xtreme 2 5-29-14
While prices have not yet been determined, it is probably safe to assuming that both GBC Xtreme titles will sell for $4.99 and the other original GB titles will be priced at $3.99.
It is great to see these games finally become available on the 3DS Virtual Console but it is a little strange that no Mega Bundle was offered where all games are included for one discounted price.