http://www.neogaf.com/forum/showthread.php?t=1114687

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Source is latest interview of Nomura in Famitsu

Length of KH 0.2

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There are plans to include elements that are part of Kingdom Hearts III in 0.2, as well. The game is a short episode whose total volume amounts to that of about one Kingdom Hearts series world.
On why it is PS4 exclusive

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As for why this game is only on PlayStation 4, rather than also on PlayStation 3, director Tetsuya Nomura says it’s because the collection is supposed to preface Kingdom Hearts III and that it uses Kingdom Hearts III technology—specifically in Kingdom Hearts 0.2 and Kingdom Hearts Chi: Back Cover.
KH: DDD will be a complete remake

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He’s then asked about any other additional elements that are being added to the three titles in HD 2.8. Nomura says that all three won’t just be simple HD remakes. Since KH3D is going from two screens to one, it’s practically a complete remake.
Don't expect KH 3 anytime soon hence why they decided for II.8

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According to Nomura, it looks like it’s going to take a little longer until we can play Kingdom Hearts III, so he wanted fans to get a taste of Kingdom Hearts III’s world sooner than later, and together with KH3’s prologue that is KH3D, and a title that uses some of KH3’s tech. They thought about finding a way to put it all in one package, and decided to have it on the PlayStation 4.
Thanks Siliconera and Gematsu