Tetsuya Nomura has been a busy, busy fellow. He appeared in Famitsu this week to speak even more about Kingdom Hearts III -- after
already doing so last week -- to add a few more tidbits to the.... tidbit bouquet. Apparently Square Enix has already internally established a release window for the title, but they aren't telling anyone yet. I suppose sharing this is just supposed to make us feel better? Nomura added that development is moving along smoothly.
Nomura clarified that Kingdom Hearts III's battle system would not be like Birth By Sleep but would instead be a bit more "traditional" and more in line with the previous two main entries in the series. Most of the worlds in the game will be new to the series; evidently the team has already talked with Disney and decided on the next new world to announce.
Finally, Nomura reiterated that the third Kingdom Hearts installment would mark the end of a story, not the end of the series (we've heard this before, but that was back in 2013). Xehanort and the Dark Seeker part of the series will conclude, but decisions have already been made about the future of various characters in the series. Nomura concluded by teasting that the team is currently thinking about secret videos and the game's ending.
Source:
Siliconera