Well now that the big announcements have been done and such, it's time for me to go over what I think of the current state of the game. Just note I didn't watch the invitational tournament, so don't get upset that I said something incorrect, this is just based on what I've seen with the trailers and the showcase that Nintendo Treehouse did.
1. Veterans: They decided that it was finally time to have every character that ever was in the series, make a comeback, I imagine the 3 that people are most-excited for are Snake, Wolf, and the Ice Climbers. It's also nice that Pichu and Young Link are making a return as well, and with all the others that I haven't mentioned (if there are any others).
-Young Link: If you had eagle-eyes like I did, in the showcase, did you notice that Young Link's arrow was translucent and had some kind of orb in it? I am guessing that is to better show that Young Link uses Fire Arrows opposed to the normal ones that Link and Toon Link have.
-Pichu: Still takes damage from using electrical attacks, but that's fine, it's how Pichu was before.
-Wolf: The redesign is interesting, and from what I could tell already, he's mostly the same with playstyle.
-Snake: Still going strong with his 'unique' way of fighting, kinda hoping that they include the Codec or Palutena's Guidance, if not both.
-Ice Climbers: Definitely changed up since the last time we saw them. You no longer have to jump first if you want both to face the same way with the d-special of theirs.
-Final Thoughts: I can't wait to see the differences in the characters when I finally get a chance to play as them, I just hope that some of the new mechanics don't throw me off.
2. Newcomers: Inklings, Ridley, and Daisy, the latter of which is mildly bugging me, but eh, whatever. I think we already knew that the Inklings were going to be in, but Ridley, oh boy, that was an unexpected arrival. A character who's been wanted for quite some time has finally made it in as a playable character. Then Daisy... I honestly have no words.
-Inklings: It's great to see that Splatoon (the original) is getting some love in not just Mario Kart, but now Super Smash Bros as well! All of the weapons they use, and the nice little touch of each of them having different gear equipped (even though it doesn't matter in this case). And about what I'm saying with the Inklings we see being from the original game, just take a look at two things in particular: They throw bombs opposed to using something to launch them, and the Final Smash they use is the Killer Wail, a Super that doesn't show up in the second game.
-Ridley: A beloved character to say the least, and even though I haven't played all the games that Samus fights him in, one of which is perfectly okay according to fans I guess, I'm not disappointed with how he turned out, my only question is this: Has shooting him in the mouth always been a thing? Or was that a Metroid Prime thing?
-Daisy: Only having one game involving her, the rest of her appearances being in the spin-offs such as Mario Kart, Mario Party, and the Mario sports games, I don't really have any other words since she's an Echo Fighter. (I mean seriously, why Daisy? The Mario series has enough reps and she was already an alternate outfit for Peach)
-Final Thoughts: Overall I say that the newcomers are definitely going to make some changes that people didn't expect, here's hoping that you give us your best.
As for other little bits; One: I'm hoping that SSBU gets its own version of the Subspace Emissary, as in a Story Mode, but I won't mind too much if it doesn't, I mean, the story would be different anyway. Two: In the Ridley trailer, I noticed that after Ridley had hit a character with the "sweet spot" of a certain attack of his, they poofed out of existence, so I'm predicting that the Stamina Match mode will have characters vanish after they lose all of their HP rather than just lying around. That's all for now, when they release more information and stuff, I might, or I might not do another one of these.