You might just be misinformed. New stuff:
1) 100 new cars
2) Maybe 5 new tracks
3) Car body modifactions
4) Car tuning
5) Collection aspect (GT cafe, second hand)
6) Dynamic day/night
7) Dynamic weather ( we saw rain level as a percentage on track)
8) Driving tests
Unannounced but could stuff:
10) Bigger car count
11) Multi-class racing
12) New physics model
13) VR mode
Seriously, this is like THE dream GT game. Its got everything from the old GT games with the amazing multiplayer of GT Sport. Combine that with how well PD supports GT, the content will be packed as well.