Honestly I'm still remaining skeptical of the leak- there are still possibilities to explain the videos, and I'll probably remain so until either official proof comes out from Sakurai, or something more believable to me.
It's like everyone on Smashboards suddenly forgot that Project M was a thing. These videos would have been possible to fake using it, and there's just some things that stick out like a sore thumb to me.
-The fact that some of Shulk's moves look like they're from Marth's moveset.
-The fact that there's conveniently never "Outlines On" mode in any of this leaked footage.
-The fact that Bowser Jr's Clown car looks really akward in battle (It doesn't hover and it walks on it's propellers)
-The fact that Nintendo hasn't scrambled to take these leaks (Especially video footage) down (where are the ninjas?) I doubt Sakurai would be happy about the game leaking like this, and look how crazy they were about smashing down Pokemon X/Y leaks.
So all in all there are still a few too many little things to have me believing this 100% just yet, so I'll still hold onto some hope for Krystal. -but if it is real, then I guess all i can do is hope that she'll be DLC someday down the line, and I'll also be sad that yet again her potential was overlooked by Sakurai.