Only the New 3DS and New 3DS XL will support 3D effects in the upcoming title The legend of Zelda: Hyrule Warriors Legends. Producer Hayashi Yosuke said this in an interview with the Japanese site 4Gamer.
Stereoscopic 3D had to be limited on the older 3DS hardware in order to accommodate the level of action and number of enemies on-screen, according to Hayashi.
In that same interview, Hayashi also confirmed amiibo support for the title. While not going into detail, the produced did say that Hyrule Warriors Legends will be able to interact with the figurines.