User blog comment:DoodleFox/Ridley The Hack/@comment-5623885-20141108162005

Considering Toon Link was a stage element on the Spirit Train, he was deconfirmed a while back; and yet's he's in Smash 4; the Duck Hunt Dog is the exact same case.

We don't know what Sakurai thinks, so we honestly can't say for right now whether or not Ridley is playable or not.