Looking for clues is fun, but I really don't believe Sakurai has ever made an intentional hint at anything in a post of the day (he makes veiled references to other games for fun, but not future Smash reveals). I mean, even if we stretch for this instance, why would it be 2/17 when the Direct airs on 2/18 in Japan?Nope, I thought the same and went to check Sakurai's original post. It's 00111.
Anyway, not that it's the big deal, I think Sakurai has done things like this before just for fun.