At least one other Kingdom Hearts title will release before a "KH4", according to Kingdom Hearts III Ultimania - Kingdom Hearts News - KH13 · for Kingdom Hearts
Kingdom Hearts 3 limited edition PS4 Pro: where to buy, price, release date - Polygon
Kingdom Hearts III - PS4, Xbox One , hra od Square Enix | Sector.sk
Petition · Release Kingdom Hearts HD 1.5/2.5 Remix for PS4 and Xbox One · Change.org