Now this is just from what I've gathered at Gamefaqs, so you don't have to take it as truth, but I'd say that it's pretty likely since quite a few people are saying this to be so, as well as the person who first showed off the pictures of the leaked copy of 358/2 Days, who has apparently beaten the game.
Xion is supposedly a puppet created from leaked memories of Sora. Apparently she ends up getting absorbed into Roxas, giving him the ability to duel-wield.
That's pretty much it.
UPDATE:
YouTube - Kingdom Hearts 358 2 Days CUTSCENE BEFORE XION BATTLE
Xion revealing herself to Roxas.
Xion is supposedly a puppet created from leaked memories of Sora. Apparently she ends up getting absorbed into Roxas, giving him the ability to duel-wield.
That's pretty much it.
UPDATE:
YouTube - Kingdom Hearts 358 2 Days CUTSCENE BEFORE XION BATTLE
Xion revealing herself to Roxas.
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