In an interview I read a little while ago, it was said that this video is of the past and future at the same time. KH3 isn't definite as of now, and they are working on another title for the time being, but, the guy who was being interviewed said he had a sure idea of what KH3 would be about. Also, he said that it would explain the Keyblades in much more detail then we are given now. My thoughts? The main storyline would be about Maleficent and her second uprising, however, the trio finds something stringing themselves to past events and trigger a sub-story explaining the Keyblades, how they came to be and why only certain people can weild them now. And their tie to the past would also fit nicely with one of the major themes of KH, how we are all connected through different means. X3 Just my ideas. I'll post the interview once I find it a little later.
Sorry for any typos.. I'm being pushed off the computer.. >___<