Even if i don't want to be spoiled again by rumors, at this point Vergeben has been the closest when it comes to telling us who will join the roster around a month or 2 before the reveal of said character, so he's the person we should pay a tad bit attention. The minecraft content could still happen with the Banjo update, so that bit from him hasn't been deconfirmed yet (for all we know it might've been a scrapped idea).Somewhat off relevant, but Sabi's source (the one that posted that image of a Starling on a roof) is saying it is indeed a hint to something in the future. Nothing to guarantee it being Smash-related, but the two most popular guesses are Geno and Edelgard.
To get to the point, anything that suggests a Three Houses character (while I don't really want one) is tremendous news for us. The argument that SwSh is too late for a character in Smash becomes completely null and void if true.
Also, to me there's a big difference between Three Houses and Sword & Shield's release timings, with Fire emblem giving us way more time between it's release and a character's release. For a gen 8 pokemon to be a dlc character it would barely cut it being the final character: from the games launching in november and the character releasing 3 months later (and even then it seems too soon imo). I'd say we have a better chance getting in a second season of dlc.