As we all know there are some Organization members that have not made a return in the KH games since KH2:
I really find it strange that they never been mention in the other games. Not even in Dream Drop Distance when everyone became Somebody's again. If they are were one of the Black Coat guys in the End Game of Dream Drop Distance. Why not show the faces? Why being so mysterious about that?
This really makes me wonder if it's possible that they will be return in the Next Saga.
Kingdom hearts IV instead of Kingdom Hearts 3.
Well, I think it's possible that they just wanted to keep their identities a surprise for III. Or simply that there wasn't a place for them in 3D - everyone from Xehanort to Lea apparently lost their Hearts in Ansem's Lab (by the way, still want to here the story of what Lea and Isa were doing there), so I presume the others lost their Hearts elsewhere.
They might be complete people again.
I doubt any of them especially Larxene are the other true members of the 13 SoD. Marluxia perhaps might be one of them. But I just doubt because members like Marluxia and Larxene were trying to use Sora to overthrow the Organization, thus betrayal. Luxord and Demyx (especially Demyx) I guess they were inadequate as well of what Xenmas said to Sora. Of what they did caused them to not deemed worthy of being Norted.
Those other 6 are all guys. They were all sitting the same.
As for them coming back in the next saga, I don't really know.
Honestly, I think Luxord has the best chance - he was one of the last members standing, after all. Also, I believe the trailer from E3 2015 had one of the chess pieces Xehanort was using decorated with a pair of dice? That might be indicative of something. Plus, I think Nomura said that he was his favorite Organization member.
Marluxia might be in too - Nobodies that bare a pretty strong resemblance to him also appear in that same trailer. Now, he was a traitor, so one might think that he wouldn't be up for consideration...but he was undeniably powerful, and it's not like Sora was a willing candidate either. Maybe he'd join if they, ah...broke him in a little.
I think the appearance of those Nobodies makes it likely that he'll show up, though, or at least be referenced somehow.
Ikr. Probably Emyd.
Luxord would be Lurdo
Larxene > Arlene
Marluxia > Lumaria
Eh, personally, I'd hope for something a little more...creative for Larxene? Like Relena, maybe? Or Ernela? Something that didn't just move the "L" around, I guess.
My personal guesses:
Demyx > Myde (though Emyd's good too)
Luxord > Rolud (although it's worth noting that "ludo" is apparently Latin for "I play". Maybe "Ludor", then?)
Marluxia > Imalar (I don't think I've heard this one before)
Larxene > Relena or Ernela
Anyway, I would actually if they did make an effort to find some way to include these guys. Not to the detriment of the story, mind you, but I'd like them to be included, if only to fill in the blanks in regards to them. I at least want to know what their names were.