Like I said in this post, the thing that made me pay attention to my friend's Zelda rumor from April is because the Polish Amiibo leak supported it so heavily:
It makes no sense that Nintendo would waste time, money, and assets dealing with Square over an updated costume when they could just port over the old one getting the same amount of money. A Geno costume but with a face is not gonna make that much of a difference since the fans know he got...
smashboards.com
Skyward Sword kind of adds a new dimension to Amiibo theory because the Smash Zelda rereleases do seem to be tied to upcoming Zelda announcements. The Smash Mario Amiibo rereleases obviously have to do with the 35th anniversary but, like I HMMMM'd about most of the summer, this puts a beeg spotlight on why the hell they're planning on rereleasing almost every single Splatoon Amiibo soon too. Also, just to repeat the Smash Amiibo that haven't been rereleased yet:
Smash 4 Amiibo Rereleasing in September according to the Polish Amiibo leak:
-Luigi
Ryu
Ultimate Smash Amiibo Rereleasing in September according to the Polish Amiibo leak:
-Young Link
Smash 4 Amiibo that haven't been rereleased yet:
-Peach
-Yoshi
-DK
-Diddy
-Falco
-Kirby
-Ness
-Lucas
-Corrin
-Game and Watch
-Pit
-Dark Pit
-Palutena
-ROB
-Duck Hunt
-Miis
Ultimate Smash Amiibo that haven't been rereleased yet:
-Daisy
-Ken
-Ice Climbers
-Dark Samus
-Ridley
-Simon
-Richter
-Pokemon Trainer
-Squirtle
-Ivysaur
-Pichu
-Inceniroar
-Snake
-Wolf
Might be worth keeping an eye on this.