Isn't KH3 PS4 only anyway 
They need to put all the compilations on PS store or something so that way for the first time you'll be able to play all the relevant KH games on one system for the first time.
So that's HD Dream Drop, cutscenes, and BBS 2. Based on how long BBS 2 is, that'll determine whether or not it's worth buying

They need to put all the compilations on PS store or something so that way for the first time you'll be able to play all the relevant KH games on one system for the first time.
TGS 2015: KINGDOM HEARTS 2.8 FINAL CHAPTER PROLOGUE ANNOUNCED
Set to lead right into Kingdom Hearts 3.
Square Enix has announced Kingdom Hearts II.8: Final Chapter Prologue for PlayStation 4.
The title follows the company's model of releasing three titles in the Kingdom Hearts franchise in one compilation.
Kingdom Hearts II.8 will contain a HD remaster of Dream Drop Distance, along with scenes from Unchained X called Back Cover, set to tell the tale of the Foretellers and revealing new parts of the series' history. The final part of the collection is Birth by Sleep 0.2 - A Fragmentary Passage -, which is a completely new part of the story taking place after the events of the original Birth by Sleep, told from the perspective of Aqua.
The first official trailer for the game will arrive on September 17.
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Such an announcement was teased last week when something called Kingdom Hearts 2.9 seemed to leak. Apparently we were wrong about the name, but as speculated this newly-announced game will indeed directly lead right into the events of Kingdom Hearts III. Sadly we're still waiting on a version of first games for PS4 - such a thing has certainly been teased before.
During Disney's recent D23 Expo in North America, we learned Kingdom Hearts 3 will feature a world based on the 2014 film Big Hero 6.
So that's HD Dream Drop, cutscenes, and BBS 2. Based on how long BBS 2 is, that'll determine whether or not it's worth buying