User blog comment:RainbowBowserJunior/Mii for Smash Bros?/@comment-6137196-20140607210817/@comment-5196731-20140608160724

What you just said, about the Mii NOT in a cage? That stage was probably still in development, until the SSB Direct video, where they have decided to add a Mii, inside a cage. And yes, the Mii will never be playable whatsoever, especially not in E3 2014, that's for sure.