This morning on Twitter, Square Enix confirmed that Final Fantasy Explorers will not be supporting stereoscopic 3D (aka the 3D effect). This was previously mentioned at TGS 2014 but is being confirmed again today. However, the title will support the Circle Pad Pro attachment, as well as the New 3DS's C-Stick.

On both portables the second stick will be used to control the camera, and on the New 3DS "ZL" is used to lock-on monsters and "ZR" to lock on summons.