GTPlanet have picked up on the wording of an answer Kaz gave during an interview with IGN regarding GT5's rumoured track editor. In the interview, IGN staffer Ryan Geddes asks if a track editor would make Gran Turismo 5's development any easier (due to the players making tracks in the game). Yamauchi responds, A lot of the courses we set up, we take a long time fine-tuning the details and building the track, so it would probably be a bit different than the types of tracks the users will set up in the game."
The keyword interestingly being "will". Could be a translation thing, but it's totally interesting all the same. Will a final feature list for Gran Turismo 5 ever be released?