Amiibos for Spring/Summer Have Been Revealed
Going from May to September
The next waves of amiibos have been revealed, as well as showing when the fourth wave will be available. Joining the fourth wave is Jigglypuff and Greninja. This wave will be available in May.
In July, Dark Pit and Palutena from the "Kid Icarus" series will be available.
In September, Olimar, Bowser Jr., Dr. Mario, Zero Suit Samus, and Ganondarf will be available.
Some amiibos will also be exclusive through retailer again. Keep a watch out for when the retailers make an announcement.
Source: Nintendo Direct