Yes. Nomura also stated that KH3 will be the last game of the "Xehanort Saga" and then there'll be new KH games, as far as I remember. However, I don't remember if he said Sora would still be the main character.
As 3D is the prequel to KH3 (according to Nomura I don't know when/where), the ending may be qite spectacular.
Also, I prefer Riku with his shorter hair.
Oh yeah, you're so right! He was really cool. Too bad they dropped his sunglasses.
I was hoping to see him in the past in BBS but nah, it didn't happen.
According to Nomura, it's in the works.
Also, this is great. I liked FFX (one of the few FF I've played, among VI, VII and IX - and XII: RE on DS too). I hope they'll make a HQ version of the OST, even if the music was already very cool.