I think y'all are misreading that. Looking at the quote again:
Now, the user's (
leroidys I believe) friend telling him all this didn't say "there are only 1-2 more unannounced newcomers in general", that just what
leroidys for some reason assumed. What I think his friend was saying was that there were a few more newcomers they wanted to show at E3 but didn't, and, looking at
salromano's 'leak' above, I think we might know who they were. I'm fairly certain we won't get a pitifully small amount of newcomers.
I'm fairly certain that this is the information we needed to verify the Salromano leak. First, because it's a 5-year member of Neogaf, we know that he's not some troll, pulling this out his ass for kicks like the Gamefaqs kids.
With the story leroidys' friend told him, it seems pretty clear that the source of Salromano's prediction/leak also played this E3 build and assumed, rightly so, that all of the newcomers in it would have been revealed at E3, since that was the version we actually saw
played (albeit for one short match).
My assumption is that the plan
was to reveal all 6 of the newcomers at E3. This would make sense and continue the pattern (Melee-4, Brawl-5, U/3D-6). However, I'd imagine executive meddling may have gotten Little Mac, Pacman, and Mii held back for marketing (or other unknown) reasons.
Or this is all just a complete hoax perpetrated by people who just don't give a ****. Who knows.