Hey, new here, but just wanted to add a couple of theories. First off, I think KHIII is going to be a prequel. My reasoning is that, at the end of the Final Remix secret video, Mickey appears carrying the Star Seeker keyblade. Since this is the keyblade Sora gains after meeting Yen Sid, it stands to reason that the video takes place while Mickey is still under his tutelage.
Other than that, I'm wondering at Xehanort's true identity. I don't mean his relationship to the armored keybladers, but the meaning to his name. Just like how Roxas' name is an anagram of Sora with an X in it, this seems to work with all the Nobodies in Organization XIII. (In theory, still no clue what Axel's name would be) So, I tried with Xehanort, and came up with No Heart. Any idea what it could mean that his name worked that way before he became a Heartless and a Nobody.