https://www.gamespot.com/articles/kingdom-hearts-3-release-date-will-be-revealed-nex/1100-6459063/

Square Enix plans to announce a release date for Kingdom Hearts 3 very soon. During a preview event, game director Tetsuya Nomura said, "We are very close to really finalizing the date right now, so we do plan to reveal it early next month."

E3 2018 starts early next month, so Square will likely announce the date during its press conference. According to a Twitter post, the company has a "special video presentation" planned, revealing the "exciting future of Square Enix." Square's E3 presentation will take place on June 11 at 10 AM PDT/1 PM EDT/6 PM BST.