As was previously reported, Kingdom Hearts 358/2 Days Ultimania, a book to accompany the Kingdom Hearts 358/2 Days, has been released in Japan. It contains an interview with Tetsuya Nomura regarding the future of the Kingdom Hearts series, and Kingdom Hearts Insider have managed to translate it entirely.
The interview, seven pages long, is with the series' director, Tetsuya Nomura. He discusses his thoughts concerning the development and release of 358/2 Days, and then goes on to discuss the production of Kingdom Hearts coded and Kingdom Hearts Birth by Sleep. He also talks about the future of the series, beyond those two games. The interview is quite lengthy, and may contain spoilers, so please go to the full article to read it.