[FallenKnight]

A new Battle Against ???? .. I won't Spoil it for anyone who doesn't know if you want to know PM me..

[Squall Leonhart]

I think its Roxas.... look at the First image... its wearing 2 keyblades... who is the only one who wears 2 keyblades, and are the same keyblades that Roxas used on KH2..

[FallenKnight]

Yes now that it's out lol.... (it's been out sometime now) it's ROXAS right before you enter the Last level but IN final Mix it's not just a cut-scene it's a full battle.. which looks like fun

[Cloud_Fair]

Yea the only people with Double Keyblades are
Sora And Roxas
And if Sora is the one right there, and in the game Roxas fights Sora in that outfit...then it must be Roxas...