Going to comment on a few things from the last few pages:
1) I have to wonder if Sakurai has realized that no matter what he does, fans will never be satisfied. This realization itself really doesn't give him incentive to be adding literally everyone the fans want.
Like even if Wednesday gives us like BWD, Ashley and K.Rool, people would still be asking for more. Even if this game has 14 newcomers, fans would want more. It's tough being the "Smash Man" because even if you strive to please people, it's ultimately only a moment to moment goal.
2) Anyone expecting Subspace Emissary 2 is going to be disappointed, simply because i'm pretty sure we already know the memory size of the game itself is 16GB (somebody can fact check me). A game of that size absolutely has no chance of having another SSE based on the size of Brawl and the dev time devoted to it.
I for one would love a new Melee-esque adventure mode, and I hope we get one.
3) Going in, I would expect at least 1-2 characters revealed. There might be one at the beginning and an explanation of their moveset, and then an echo. There might be 2 unique characters. My bet right now is only 1, but I see the potential for 2. This IS a Smash centered Direct after all. (K.Rool and Dixie hype, yo!)
4) Hot take: Any gameplay additions are already discussed. Sure, they could update the build with new techniques, but why then have an outdated design available for fans to try or pros to play at the invitational from the get-go? That would be silly. Anything as far as gameplay has been discussed at E3.
5) Be prepared for disconfirmations. By no means do I think they're going to have similar sections of "here's like 20 more assist trophies", but I absolutely think we're going to see at least a few. That could be something like Mimikyu as a Pokeball, Chrom in a Final Smash, or Ashley as an AT. Those are all disconfirmations. Please save yourselves the trouble of trying to reason with logic and believe they still have a chance.
We all have choices to make. If your character gets disconfirmed, it's all on you if you choose to believe they still have a chance. It hurt like hell when I realized Snake wasn't going to be in Wii U. But I enjoyed the game without him.
6) I get the feeling we'll get mostly game modes (Classic, Adventure, All-Star, Stadium modes) Trophies, Stage Builder, Mii Fighter costumes, alternate costumes (or a shop where you can buy stuff) will be shown off. I don't think everything I listed will be shown, but a good mix.
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Again, be excited but temper your expectations. Regardless, I will be excited for what or who we get. I'm not saying the man is unpredictable, but we could get anything as our next newcomer. I think it's possible we get K.Rool & Dixie (newcomers from the same series, with Dixie POTENTIALLY being an echo), Rex & Pyra (I think they might have been late for development, but would be a good pick among the Japanese fanbase), Ashley, or somebody else. This is going to be nice.
Unfortunately, we're going to probably get over the new information and ask for more. Mainly because this fanbase is spoiled like that...myself included!