In this edition of Square Enix non-news, the company is currently forecasting for their next two upcoming Japanese RPG blockbuster single player titles to launch somewhere "in the next three years or so". This was stated by CEO Yosuke Matsuda himself during an outline of the company's fiscal year 2017 performance (which has recently ended on the 31st March this year).
“This slide shows our release lineup for FY2017/3 as well as for FY2018/3 and beyond. We plan to launch each of these upcoming titles in the next three years or so.” This would mean that both Final Fantasy VII Remake (presumably the first part of the remake given that it will not be released as a single package?) and Kingdom Hearts III will hopefully both be on store and digital shelves by 2020. [EDIT: It doesn't mean both games and the new Marvel game WILL be released in 2020. It just means based on the above slide that the games will be out any time between 2018 and 2020.]
As context, recall that Kingdom Hearts III was announced for PS4 and Xbox One back in E3 2013, before the current generation consoles launched. Two years later, Square Enix left investors squealing with delight when they did the seemingly unthinkable and announced an actual FFVII remake in the works. In the two years since, we know very little about the game, with updates seldom and intermittent. The biggest revelation since is that the game will be said to be "episodic".