I wasn't going to post about this initially, but I guess it might be worth it now.
An anonymous source reached out to me on Twitter yesterday saying Shovel Knight is absolutely coming to Smash and that I can "quote them on it." Of course I don't believe anything like that sight unseen, and I let them know as much, but they proceeded to give me very, very specific details about Shovel Knight's supposed moveset and stage - too many details for them all to be lucky guesses.
Who knows if any of it is true, but they also said he's getting revealed at PAX... so at least I don't have to wait long to find out if they're full of it or not. I have reached out to them again in light of the amiibo getting leaked, but haven't heard back yet.
I'll keep you guys updated, for anything this little situation is worth.