Remember Xigbar says "they keep getting younger and younger..." so it's probably a past Keyblade wealder that is most likely related to Sora too.

Quote Originally Posted by Jesse1 View Post
Three Power Ranger Villain-looking things have keyblades....and there's like, lots of keyblades all over the place...and that's all I remember.

No...I don't think it's Sora, because in an interview someone said the next installment would NOT be a numbered sequel, or an in-between thingy like CoM. So...That leads me to believe that the storyline will be completely different and possibly unrelated to the characters of KH.
Yeah they all pick up Keyblades and you see a figure walking towards the screen. That's the Secret Ending in the US version. That picture isn't in the US Version.