In the same Famitsu/Nomura interview in the previous news post, the main focus was on the Kingdom Hearts franchise. In it, Nomura says that the current Kingdom Hearts story is all about Sora, including the upcoming Kingdom Hearts 3. He also mentions that he has another game ready in mind for another character that is not Sora. He understandably wouldn't go into it more than that.
As far as Kingdom Hearts games we already know about, Famitsu asks if he's waiting to release Kingdom Hearts III for the KH series' 10th anniversary in two years. Nomura said that's not what he's planning for KH3, but implies that there may be something special for that event.
Source: Famitsu Interview transcript
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