I know Nomura has confirmed them to be new and has said he has even drawn their faces. However, Nomura has a really good way of being deceptive. He twists his words to make people think the way he wants them too. Like he said with KH2 Final Mix+, everyone thought there wasn't going to be one based on what he said. then later, he confirmed it was a definite. With the knights/chasers, he has said they are new characters. However, they may be older versions of Sora, Riku and Kairi, let's say (I'm not saying it's true, I"m trying to support my argument), which to some people may feel them to be different people with different appearances, changed personality possibly and different attires. Nomura is a very clever man and he knows how to be deceptive and get fans ot think the way he wants them too. Don't take everything I've said as being true. I personally believe that the knight/chasers are new, but for those who want to believe it is Sora, Riku and Kairi - I"m giving them a little hope. In regards to it being Xemnas, it could be possible. With Nomura's deceptive ways, when we defeated Xemnas, we weren't to sure to believe he was dead due to Riku saying something along the lines of 'It's not over yet!' and all the nobody's appearing. That is if the sequel to Kingdom Hearts 2 is set in the future. Remember, Don't take everything I've said as being true. I personally believe that the knight/chasers are new, but for those who want to believe it is Sora, Riku and Kairi or Xemnas or Winnie the Pooh (lol, that's funny) or whoever - I"m giving them a little hope