Kingdom Hearts III Ultimania (the official companion book for Kingdom Hearts III) has released today in Japan. Details from the book, and particularly the important interviews contained within, are starting to appear online. These details give hints towards the future of the series.
One thing said is that there will be at least one Kingdom Hearts title that releases before a Kingdom Hearts 4. They also stated that they can't talk about the next title yet, but that "concepts for various works" that come up in the interview. This follows series director Tetsuya Nomura's comments about the future of the series made yesterday.
Edited by DChiuch