We already know they have 11 or more menu books and a whole host of races just sat ready to go that they're holding back.So in what way is GT7 unfinished?

New Gran Turismo 7 Events Revealed in Jimmy Fallon Video
Clues for what might be coming up in future updates to Gran Turismo 7 have come from a rather unexpected source: The Tonight Show Starring Jimmy Fallon. Current host Fallon was playing GT7 as part of a recent broadcast of the nightly talk show -- the longest-running talk show in the world, closin

They have International and Super Licenses with no use for them because they didn't finish adding/enabling the corresponding events.