Gamespot reporter Alexa Ray Corriea had the opportunity to sit down with Kingdom Hearts co-director Tai Yasue. During the interview, Gamespot asked Tai Yasue about whether or not Final Fantasy worlds had a place in Kingdom Hearts 3 and if the PS3 collections would ever make their way to Playstation 4.
The answer to the first of these is the most standard response. Final Fantasy characters have appeared over the many games in the series, making cameos in original and Disney worlds. Tai Yasue asserts that a world taken from the Final Fantasy world (example Spira from Final Fantasy X) would not be included at all. All worlds in Kingdom Hearts 3 will be original or based on Disney properties.
On the topic of a Playstation 4 release of Kingdom Hearts HD ReMIX's 1.5 and 2.5, Tai Yasue reveals that Square Enix aren't ruling it out as a possibility, but aren't quite ready to announce them just yet. Hopefully a Playstation 4 collection will be announced soon to compliment the upcoming release of Kingdom Hearts HD II.8 Final Chapter Prologue.
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