Ganon is cool, but I'm still waiting for Ganondorf first.
Last I checked, Ganondorf is a playable character in Smash...
I just wish that people would stop saying there's no point of having Squirtle and Ivysaur coming back as standalone fighters like Charizard because they aren't popular/important enough to be standalone fighters like Charizard.
Squirtle and Ivysaur would be good DLC choices as they were both good additions in Brawl. They would have been in if transformations hadn't been scrapped, so they likely were part of the planned roster.
Lucas and Wolf should come first, though, especially since Mewtwo is the first DLC, which makes me defend that the next few characters shouldn't be from Pokémon.
Franchise variety is good, after all.
EDIT: On the subject of Kid Icarus, I find it very unlikely there will be any newcomers.
As for Pittoo, he's give or take. He'll either stay due to how little work he actually requires (and get blamed again if any character is cut or certain new characters don't get added) or be cut specifically for being a divisive bonus character.
I don't see any Kid Icarus newcomer, unless a really major character debuts between Smash 4 and Smash 5.
What we have is good enough, I'd say.
As for Dark Pit, I'd guess he could return for the next game on the same vein as he did Smash 4. Same for Lucina.
It's hard to say, though, as there's no precedence to different character costumes in previous Smash games. Things like Alph, Koopalings, male and female variants are a Smash novelty. The closest thing was Wario in Brawl and he still keeps that alternative (though he did lose some color variants).
What could happen is Dark Pit and Lucina being downgraded to costumes, but knowing the rationale behind Dr. Mario's return, I highly doubt such a thing. The changes they have are really minor anyway and Sakurai has that philosophy of trying to have as many veterans returning as possible, stating that all characters have fans and whatnot, so I guess that given their ease of implementation, they could be here to stay.
I hardly call Lucina and Dark Pit clones, but glorified costumes. That's what they are, given their inception.