On December 15, 2017, user Wrestleman posted two screenshots of an alleged new world in Kingdom Hearts III sourced to a Square Enix FTP server. Following this, other similar screenshots from the same world surfaced on Imgur on December 23, 2017.
Since then, more Kingdom Hearts III developer's content was made publicly downloadable from the server; they have quickly been taken down, but it is still possible to see the file names (most of them dated April and September 2017), which give away a partial list of worlds in the game.
Upon investigating the leaks, KH13.com have reason to believe these are legitimate.
However, due to ethical and copyright issues, we have decided to not report on them in detail any further.
We have created a Kingdom Hearts III Spoilers subforum where fans can discuss these leaks.
KH13.com's spoiler policy on Kingdom Hearts III allows discussion on publicly announced content (eg. trailers, interviews, promotional pictures, etc.); however, leaks are to be discussed in the Spoilers subforum only. Avatars, statuses, and thread titles must not contain spoilers. We may be revising our Kingdom Hearts III spoiler policy in the future, according to future content releases by Square Enix and Disney.
We hope that fans understand our decision and respect the work done so far by the game's developing team by not divulging the leaks where they aren't warranted.
Thank you for your cooperation.
To visit the Kingdom Hearts III spoiler subforum, click here.