Quote Originally Posted by Sephiroth's Cage
So do we have ANY idea who the person in the sand is?
All we know, is that we can assume he/she/they can use the Keyblades. This means he is actually Sora, Roxas, King Mickey, Riku, their ancestor, their alternate dimensional form, or their descendants. (Probably Sora/Kairi or Roxas/Naminé). The weapon the main character was holding was also a Keyblade of some sort (I couldn't see the chain, however).