From the interviews I’ve been reading they say that this was merely an early release for the shoe completely for the Micheal J Fox foundation. I’m pretty sure they will be released in 2015
http://theshoegame.com/articles/nike-mag-full-history-story.html
this Tinker interview says that they were released early. Also some cool facts about how the original shoe was developed.
On a side note, I’m a HUGE fan. Love the shoes, love the movie, want the hoverboard.