Square Enix's current project, Kingdom Hearts HD 2.8 Final Chapter Prologue, will port Kingdom Hearts 3D [Dream Drop Distance], which was released in March 2012, to the PlayStaion 4 as a remastered full-HD version, Kingdom Hearts [Dream Drop Distance] HD, that will be compiled with Kingdom Hearts Unchained χ[chi] and Kingdom Hearts 0.2 Birth by Sleep.
While the main story will focus on the 2012-release where Sora and Riku undergo the Mark of Mastery exam in anticipation of future threats, the other featured titles will be used to connect the Kingdom Hearts 3 storyline with the ones that came before it.
Square Enix devised a clever way to link the Kingdom Hearts 0.2 Birth by Sleep storyline to that of Kingdom Hearts 3 by introducing a new playable episode into the remastered version called A Fragmentary Passage, which will be played from Aqua's perspective. Note that Birth by Sleep precedes Kingdom Hearts 3 and events on the latter takes place after the former's storyline concludes.
A high-definition movie, called Back Cover, is also a new feature in the remastered version. Back Cover will highlight the mysterious story of the Foretellers, which is showcased in Kingdom Hearts Unchained χ[chi], a yet to be released mobile title of the Kingdom Hearts franchise. The movie will tie up the earliest parts of the series' history with the Kingdom Hearts 3 storyline.
Square Enix has released the new Kingdom Hearts HD 2.8 Final Chapter Prologue's announcement trailer last Sept.16 through the official Kingdom Hearts YouTube Channel.
Kingdom Hearts HD 2.8 Final Prologue is predicted to hold the fans' interest until the release of Kingdom Hearts 3 where the addition of a new world was confirmed.
The featured world will be based on Disney's 2014 animated movie, Big Hero 6, that features Hiro, a robotics prodigy, and Baymax, a healthcare robot, along with four other companions, as they fight the bad guys within San Fransokyo - a combination of Tokyo and San Francisco.
Details of the Big Hero 6 integration on the upcoming PS4 title are discussed by Roy Conli, a Walt Disney Animation Studios producer, in the video below.