This will probably be rather late by the time this is posted, but:
The "low priority junk" on Jigglypuff is a legitimate issue.
For the first time in
years, we are actually given an inside look as to how Sakurai goes through Pokémon other than just statements about the process being difficult.
The only case that it doesn't seem to apply to is Pokémon Trainer due to a lot of this not being applicable at the time.
-What is the "hot" Pokémon? (As in, which Pokémon is popular and marketable.)
This is essentially what got Pikachu and Jigglypuff in the first Smash. (And before someone points out a "duh" on Pikachu, I'm speaking within context of being chosen instead of someone like the Pokémon Trainer.)
While Pikachu is still a "hot" Pokémon (how can it not? It's the mascot, after all.), Jigglypuff has fallen from its pedestal quite some time ago and hasn't quite recovered. This is why it was low priority in Brawl, and why she will very likely be low-priority again. And NO, being one of multiple older Pokémon to gain the new Fairy type does not help it's case, damn it.
Pichu (outside of being an easy clone and being a joke character) and Lucario are also examples of this, given that they have been heavily marketed since their debuts.
-Who's got a recent movie?
This is a major reason why Sakurai planned on Mewtwo in Smash 64 and why it was added in Melee. (That, and the movie options
after Mewtwo in Melee's time, Lugia, Entei, and Celebi, were not that feasible in comparison). And since Mewtwo did not have a recent movie, it was low priority.
This is also clearly a big reason Lucario was in Brawl. Especially since his movie was in theaters in Japan just a few days after Sakurai "finalized" Brawl's roster. Knowing that, I have come to realize that Lucario too may likely be lower priority much like Mewtwo was in Brawl. That is, unless the fact Lucario is still a "hot" Pokémon is enough.
With Mewtwo having a
very recent movie (despite it being a new Mewtwo with a brand new form), as well as Genesect co-stars, it would come to reason that Sakurai is looking at those two Pokémon this time around as potential additions.
-Who will be central to conversations about Pokémon going forward?
Within context of what Sakurai said, this is referring to looking at the anime, movies, etc.
This is where even someone like Meowth can be seen as a possible candidate, given that he's the second most prominent Pokémon in the anime after Pikachu.
Jigglypuff? Not so much. Or at least at this point in time.
-What is unique about them? Where do they fit in next to everything else? What do they have?
This is so far the only place where Jigglypuff has something going for it. But then again, a lot of Jiggly's attributes are based off Kirby. At the very least, her special attacks are quite unique especially for their comedic value.
When all this is attributed, the "Original 12" excuse is nothing but a single warrior against an entire army of equal skill.
Not saying Jigglypuff is as good as gone, but pretty much that it shouldn't be a surprise if she is due to being out-prioritized.
This is precisely why I feel Snake is going to stay. Do you guys really think Sakurai would straight up tell his friend to screw off like that? I would surely think not.
Snake being removed doesn't instantly mean he's telling Kojima to screw off, though.
It could be a multitude of reasons;
Sakurai and Kojima could simply have made an agreement for Brawl only, just like the case of Gon in Tekken 3.
Konami could be against Snake being in Smash 4 for whatever reason. (Most plausible reason would be that the company would happen to be on bad terms at the time.)
Kojima could be satisfied that Snake was in Brawl to begin with and not seek to have him in Smash again.
Nintendo's higher ups could actually actively step in and not allow Sakurai to add Snake again.
Sakurai could explain to Kojima that Snake no longer fits within Smash's style due to the direction Smash 4 is going. (Kind of a bs reason with easy counterpoints, but still possible)
etc.