Jesse McCartney, voice actor of sometimes-lead character Roxas, let slip that he was "recording the next chapter" of the Kingdom Hearts series on his Instagram page, posting a photo from his perspective in the voice recording booth.
Pictured is a screenshot of the game with a glimpse of his script, and the caption, "For all you 'Kingdom Hearts' Fans. Recording the next chapter!" Judging by what is on the screen in the photo, it's fairly safe to assume that this is a shot from Kingdom Hearts 1.5 HD ReMIX, which includes HD, remastered versions of the story sequences from the DS-based, Kingdom Hearts: 358/2 Days.
With that being said, the shot is more than likely a remastered scene from the DS title for which he is recording lines that were text-only in the DS game. Kingdom Hearts 1.5 doesn't include 358/2 Days as a game, but it does include the story sequences to help fans catch up.
Square Enix has yet to make an official announcement, but any western release will likely be English only, as has been the case for previous titles in the series. It will also mark the first time a 'Final Mix' version of a Kingdom Hearts game has made it overseas.