Nintendo unveiled its entire Holiday lineup this morning. Star Fox Zero and the Falco Amiibo launch on November 20th in America and Europe (and probably Japan too). The Falco represents the last Smash Bros Amiibo to release in 2015. So it looks like we'll get a day of Star Fox this year after all!
By the way, check out the new box art for Star Fox Zero compared to the original)! It looks like they changed the shape of Fox's face slightly to make it a little more realistic, and added more fur to him and the other characters. They also added little details throughout, like battle damage/wear-and-tear on Fox's helmet and scouter. I guess the E3 demos didn't represent the final style after all! Hopefully this means slightly more realism and detail without loosing the simplicity of their earlier cartoon style.
Also notice that they added the Amiibo logo to the box art. Miyamoto has said he wanted to do something special with the Star Fox Zero Amiibo compatibility, but I think he also stated elsewhere that it wouldn't be things like extra levels or other hidden gameplay content like what they did with the Splatoon Amiibos.