If you watched they Youtube version you would have noticed the translations in the top right. And stop saying it's a new Keyblade people, if you were any good at KH2 you'd know it was the Fenrir, which everyone has known about for some time now.
I thought the knights weren't in Sora's timeline? If this knight came back in time or some junk like that, maybe he thought Sora was a young Xehanort and was trying to defeat him. Nomura said Xehanort would be involved with the next game somehow. I think he might be that creepy looking old guy the 3 knights were fighting.
Or maybe Nomura lied (again) and one of the knights was Sora. The one who went back in time to fight Sora would be him, and he'd be trying to somehow make himself stronger to avoid some type of disaster in the future where Xehanort is unstoppable.
And where does Roxas come into this? I thought he permanently fused with Sora at the end of KH2. And if you watched the video, you'd notice he appeared to be the same age, no older, no younger. Maybe Sora recently released him from himself. Or the more probable answer; it ISN't Roxas.
From what I've heard of the translation, the knight has "come to engrave his hatred of Xehanort into Sora's heart." This might confirm some of what I've said. But everyone keeps saying Riku is the rightful Keyblade master and the Keyblade only went to Sora because Riku turned to darkness at the moment he was to receive it. So maybe, when the Knight called Sora "keyblade master", he didn't know about the whole thing with Riku. If this is so, he could be Sora from the future because as far as I know, Sora doesn't know Riku is to be the rightful Keyblade master. Anyone have info to the contrary?
One thing seems to rule out the possibility of this being in the distant future, and that is King Mickey being spotted at the end of the video lookin' ready to bust some heads. He didn't look aged, but maybe the Disney characters don't age much. Look at the Timeless River world; that was supposedly the past of Disney Castle. Why was Mickey using the Starseeker? Do you think there was a reason? And if I'm right, and the knight did travel back in time, this would make it possilbe for the King to go to the future, wouldn't it? Maybe it's only something Keybearers can do; I can see Nomura coming up with a locked door to the future. In fact, he did just that with the Timeless River in KH2, except it went to the past. Maybe this whole thing can be answered with the Cornerstone of Light. It could be a portal through time, meaning the knight didn't come back in time, but Sora went to the future to fight him. The place they fight at is most likely the same place in the secret video. Hmm?
^Damn, I think that's the longest post I've ever had...