Oh. My. God. Complete lack of common sense here. Ok, seriously, I want to know what is in these minds: Why did you post this thread when you could have easily looked it up on the internet?! And when you didn't find the answer, you would have, of course, like any human being, assumed that no one else had it either! I so knew you'd ask to go into more detail! What, do you think game has been freakin' released yet?! That's all that's known, therefore, easy to find.
And, apparently, you don't seem to have any sense of the current KH universe, either. Terra hates Xehanort, and since Sora had the KK when he chose it for someone else, he thought he was Xehanort, because Xehanort took all the keyblades at the end of BBS (most likely with all the hearts of light).