judging the track list looks like theres only 4 new road tracks.
in pcars 2
Red Bull Ring
Fuji Speedway
Circuit of the Americas
Knockhill Racing Circuit

and the usual nords laser scan everyone gets.

most of it is reused content, which means there is a slight chance they had unused resourced that they could use for tyre development and other stuff.

rest of tracks are rally cross, karts, ice,ovals, etc.
Chesterfield Karting Circuit (karts)
Daytona International Speedway (oval)
Dirtfish Rally School (rally)
Indianapolis Motor Speedway (oval)
Lankebanen - Hell  (rallycross)
Loheac-Bretagna (rally cross)
Mercedes-Benz Ice Track  (no idea wtf this is)
Sampala Circuit (no idea what this is)
Sportsland SUGO (rallycross?)