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In the full interview about Kingdom Hearts 2.5 HD Remix, Famitsu asked Nomura on a status update on the development of Kingdom Hearts III. In his answer, Nomura stated that development was proceeding as planned, however the team is no longer using the Luminous Engine and have switched to the Unreal Engine 4 for a variety of reasons. He says that because of this switch there have been having some graphical rendering issues but that Epic Games is working closely with the development team to resolve them. Famitsu Interview. Translation regarding the change to the Unreal Engine courtesy of duckroll at NeoGAF.
To coincide with the release of Kingdom Hearts 2.5 HD Remix in Japan, the Kingdom Hearts Memorial Ultimania also saw a release. This guide contains content pertaining to every single Kingdom Hearts game that has been made available in addition to some some exclusive interviews and messages. Included among this was a message from series creator, Tetsuya Nomura regarding Kingdom Hearts III. Thanks to sqex.info for the translation.
We didn't hear much about Kingdom Hearts III during TGS, however Famitsu was conducted an interview with Nomura where he shares the latest information about the game as well as the possibility of a HD remaster of Dream Drop Distance. Here are some tidbits from the interview: There have been reports from the media that Frozen was going to be a world in Kingdom Hearts III. This is false as there have been no confirmed worlds for the game yet, however Nomura says that Frozen is neither "confirmed or denied" for inclusion. Choosing new worlds for Kingdom Hearts III is proving to be a difficult task. Square Enix is strongly considering creating an HD Remaster for Kingdom Hearts 3D. There are some engine-related issue that is giving the development team some issues, however right now they have advanced in the scenario writing and world choices, as well as deciding on new designs for Sora and Riku's outfits. According to the the Osaka team, Sora’s mobility needs to be nerfed as he feels almost invincible by his end-game levels. They are currently a great variety of Keyblade transformations and Nomura compared it to Birth by Sleep's original way of fighting with Keyblades. There is more to the interview, which you can read in full at SiliconEra. Update: Fully translated interview courtesy of Goldpanner from KHInsider:
The folks over at IGN are in Tokyo right now to cover TGS and have been posting some off-screen gameplay footage of themselves playing the upcoming HD remaster. It includes a look at using summons as well as exploring one of the new areas that was exclusive to the Final Mix release of the game. Enjoy!
Dengeki Online has posted their review of the HD collection, which is due to release in Japan on Oct. 2nd. Within their review they mention that there is a brand new Secret Movie to unlock! Translation courtesy of Google Translate (grammar clean up by me) and KH13.