Both games have been in development for several years now, with no indication of a release date.
While waiting for the release of the game, fans continue to voice out their requests for new characters to be featured in "Kingdom Hearts 3". In their financial briefing, as Square made a list of the games they plan on releasing for the upcoming financial year - that is to say, through to March 31, 2018 - Kingdom Hearts 3 was conspicuously missing (pointed out by Nirolak on NeoGAF).
Screenshot showing Square Enix's recent and upcoming releases.
It is possible that the company is wary of possible leaks and decided not to share any details even in internal documents like this one before they make an official announcement.
In other words, it's unlikely both games will be released in 2017. An unannounced Marvel IP license is also listed on the 2018 and beyond side. Given that it was announced at E3 in 2015, you can understand why fans are getting a little impatient. "While we are making them, I apologize that the wait will be be a bit longer for "Kingdom Hearts III" and 'Final Fantasy VII Remake.' I am very sorry, but to that degree I will make a game that will meet your expectations", Nomura said.
In a translated interview with game director Tetsuya Nomura in KH Insider, Nomura admitted that he is a little anxious about these.
In the document, Square Enix has two separate columns: FY2017 and FY2018 & Beyond. It has been revealed that the sequels for the franchises - "Kingdom Hearts 3" and "Final Fantasy 7 Remake" won't be seeing the light of day this 2017.