Well, it looks like I'm getting a PS4 Pro tomorrow.

The initial release date is 2018. It may be possible for a 2018 release date, but I think it would be in the later months of 2018.
I still have KH2FM, CoM, 358/2 days, Re:codded, and DDD to play so I'm in no rush to play KH3.

The other Playstation releases I'm forward to are:
Digimon Cyber Sleuth: Hackers Memory comming next month for the VITA
Trails of Heroes: Cold Steel 3 for PS4 only
Lost Soul Aside which is an indie action game