Re: Larxene - I'm glad we got cofirmation that she's involved somehow in KH3's plot. I really liked her character, and it would be great for them to expand on her background. As to what world she could fit into, you guys have made strong points about Frozen and Big Hero. I'd like to take sides, but at this point, I HOENSTLY CARE ABOUT PLAYING THE GAME! Hahaha. xD
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Re: Organization XIII - I think it would make sense for the narrative to feature every single member of the Organization one way or another, seeing a show this is the conclusion of the Xehanort/Seekers of Darkness Saga, and the game that pretty much rose the KH franchise into its peak was KHII. So it only makes sense for the finale to feature the elements that KH2 introduced be touched upon once more and closed.
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Re: Marluxia - Personally, the only thing clear about Marluxia is that he is a part of the Xehanorganization. What isn't clear is whether or not he'll remain a vessel for the entirety of the game. Like Chaser said, there is enough material to makes us doubt Marluxia's role in KHIII. He was just introduced as a major character in KHUx, to now be reduced to a mere puppet? A character that tried to overthrow the first Organization? There is a lot going around on KH's narrative that, as of now, there's nothing clear concerning any of the characters, so it's safe to assume and make speculation regarding Y or X (get it? Y or X, Young Xehanort, heeheehee) character involvement in Xehanort's Seekers.
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Re: Master Xehanort - I think the old geezer has his limitations. Thirteen years ago he needed a vessel. So nowadays, he still needs it. I assume trying to control 13 vessels is too much of a strain for an old coot like him. It's possible that Marluxia intends to be Xehanortified to the point of finally gaining (or regaining) the ability of wielding a Keybade, and then wrestle out of the old man's control, but the point I'm trying to make here is that someone wil betray Xehanort because I don't think Xehanort will be able to keep up and possess everyone because of how old he has become, even though I think he is one of the series' most powerful characters.