Sheesh...I bet this is why Tetsuya Nomura always puts those secret endings and stuff at the end of the KH games. So the fans could go crazy thinking about the possiblities of what might happen next.
Personally, I think that Xehanort might come back, but I don't think quite through Riku. Because at the end of the KH2 game he couldn't use darkness anymore. Another thing that's buggin me that I think I should already know, but I don't. Is that picture with the three circles and two of them are the Nobody and Heartless signs up at the top. The bottom one looks like a gear or something. Does anyone know what it is or what it represents?