Small interview at game gossip (
http://www.gamegossip.com/comment.php?id=606) , but with some very interesting news:
GG: How many hours of gameplay will there be in total?
KH: Since everyone's skill level and playing style are different and we can't really answer that. The game is several levels longer than JKII, and there are multiple endings, so playtime is even greater than in the last game.
Now that's something to look forward too. I didn't realize that there would be multiple endings.