Future of Kingdom Hearts
Regarding the future of the Kingdom Hearts series, Nomura said that those who are anticipating Kingdom Hearts III will find some answers in KH3D.
The Xehanort part of the Kingdom Hearts saga will end with KHIII, he said. He currently has a framework of some form in place for the continuation of the series after that, and Sora will remain as main character.
Regarding possible HD remakes of past titles, Nomura would only say that, separate from whether or not they will release remakes, they're looking into HD techology tests for past titles. (I'm not sure if this question and response is about Kingdom Hearts or just in general.)