EDIT:Sorry I got it wrong my bad... This is the secret ending for KH2FM+
(only avaliable in jpn or order it online).
I digress this shows a preview to the new kh game for the psp ,release not yet known, called birth by sleep which is a prequel to the 1st kh.
the 3 armored characters are Ven(Ventus), Aqua, and Terra. The old guy is xehanhort(i think thats how its spelled) and his apprentice(name unknown).
EDIT:Secret ending to both kingdom hearts 2 and kingdom hearts 2 final mix+. Ventus(ven[Roxas look a like]),Aqua(blue haired girl), And Terra(Brown haired guy) attack Xehanort(old guy) and his apprentice(person next to xehannort).The game for this preview is called KH Birth by Sleep for the psp, release date unknown.