His talk seemed rather vague. I found it disappointing, especially after how Naoki Yoshida nailed his talk earlier on MMO design this GDC. Hopefully he'll being doing more interviews while at GDC and we can learn some more information about his approach to game design and his future plans.
Its interesting that he says the boss fights are the most important parts of the game. I can definitely see that when looking at his later work, especially since Dawn of Sorrow and Order of Ecclesia had some very interesting and well designed fights, but his earlier works had atrocious boss fights. Harmony of Dissonance and Aria of Sorrow were generally terrible, and Symphony's were very hit or miss.
Also, in the Polygon interview, he mentioned that some people at Konami asked him if they could go with him. I wonder if anyone decided to quit in the end to join him.