The actual title is "Kingdom Hearts HD 1.5 + 2.5 Remix" not KH HD 4, that's a mod joke that the title was changed to.
KH1.5 and 2.5 coming to PS4 in one release in March 2017 in 60fps.
US release date is March 28, Europe is March 31 and Japanese date is March 9.
It will cost $50 USD, Square Enix North American store pre-order link https://store.na.square-enix.com/product/425625/kingdom-hearts-hd-15-plus-25-remix-ps4
http://www.khinsider.com/news/Kingdom-Hearts-1-5-2-5-Coming-to-Playstation-4-6558
Trailer https://www.youtube.com/watch?v=cAKbBSn_c0w
KH1.5 and 2.5 coming to PS4 in one release in March 2017 in 60fps.
US release date is March 28, Europe is March 31 and Japanese date is March 9.
It will cost $50 USD, Square Enix North American store pre-order link https://store.na.square-enix.com/product/425625/kingdom-hearts-hd-15-plus-25-remix-ps4
http://www.khinsider.com/news/Kingdom-Hearts-1-5-2-5-Coming-to-Playstation-4-6558
Trailer https://www.youtube.com/watch?v=cAKbBSn_c0w