From the 1up podcast they think that the next game in the Kingdom Hearts universe will be called Zero and will be on the PSP system. For now though this is just a rumor.
Square Enix and Disney Interactive Studios have announced the launch of the official site for the highly anticipated Kingdom Hearts: Birth by Sleep. Set to arrive this Summer exclusively on PlayStation Portable (PSP), Kingdom Hearts: Birth by Sleep is the latest title in the hugely successful Kingdom Hearts series, which has shipped more than fourteen million copies worldwide.
Famitsu.com shared earlier today some commentary from Square Enix super producer Tetsuya Nomura regarding Final Fantasy Versus XIII. See this story for a summary of that.
The Famitsu.com report also had commentary from Nomura on other games, both his own and from Square Enix's competitors. Here's a bit of what was said.
How did the concept behind Kingdom Hearts, one of Square Enix's most successful new concepts in recent years, come about? "I don't remember the details, but I was talking with [current Square Enix corporate executive] Shinji Hashimoto and Hironobu Sakaguchi," producer Tetsuya Nomura told Famitsu magazine in an interview. "The topic came up that it'd be nice if we could make a game with Disney. I had been wanting to make an original action RPG by that time, and I had had the basic game system for KH in my mind for a while by that point. I thought it'd be a good opportunity for me, so I raised my hand and told them to let me handle it."