My expectations have been lowered to 4 unique newcomers and 3 Echoes left to show, fitting with the 'Blog theory'.(I believe it was 7?)
If I had to guess, it'd probably be: Incineroar, Geno, Steve, and either Isaac/Skull Kid/Bandana Dee. Then for Echoes: Ken, Shadow, and Dixie Kong. I say this because of well... Vergeben.
The last newcomer picks are because they're super popular characters, and I doubt Sakurai would only have Geno up his sleeve for a community favorite pick. It just doesn't make sense he'd have one 'ballot' choice after saying he looked AT the Smash Ballot when picking newcomers this time around. I could see him doing any one of them and saving the others for DLC, after all they'd be big hits for the community and it would pull in money.
As for the Echoes, well... Dixie and Shadow are likely in the forefront due to popularity, so I'd have to guess them.
I could see a single reveal in October(Fighter and maybe an Echo) and then an info dump in November revealing the rest of the characters, stages, a heap of assists/items/Pokemon, and light shed on the Spirits mode and other modes that are new/returning.