Final Fantasy 7 Rebirth isn't even out yet, but a first draft for the sequel has already been written.Speaking at the Tokyo Game Show (transcribed and translated by Shinra Archaeology Department)
Final Fantasy 7 Remake
FF7 Rebirth story “axis” won't change from Final Fantasy VII
Final Fantasy 7 Remake: Biggest WTF questions after finishing the
Final Fantasy VII development, Final Fantasy Wiki
Final Fantasy 7 Remake Part 3's story already has a first draft
Final Fantasy 7 Rebirth Devs Have Already Started Drafting the
Final Fantasy 7 Remake Part 3's story already has a first draft
Final Fantasy VII Rebirth Tells the Story So Far - RPGamer
Midgar, Final Fantasy Wiki