New information has emerged on the long anticipated Kingdom hearts 3. According to the Famitsu interview with Nomura, the game's story will revolve around Sora who has discovered a Keyblade (most likely the one from Master Eraques) which has the ability to "return hearts". While no new Disney worlds were disclosed, Nomura has hinted the possibility of having three playable characters which will probably be Sora, Riku, and Kairi. As mentioned earlier, this will be the final chapter in the Seeker of Darkness. Look forward to a big final battle between the heores of light and Master Xehanort.
The game's development will probably not take that long either as both FFXV and KH3 dev teams are having friendly competition to see who can get their game out first--with quality in mind of course. Expect more KH3 news at TGS this October.