The track number really is worrying, but even on the official US GT site, it lists them as 20 locations. If it's 70 tracks variations of the different 20 locations, it will depend if that includes also reverse, different era variations and such. In this aspects, it looks to be pretty similar to what they've done in past GTs.
At this moment, i'm just really waiting for Gamescon in August before drawing any final opinions about GT5, since itt seems that PD withheld quite some amount of information. Probably just waiting to get everything fine tuned to the final version of the game, since in E3 it was just a demo build.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
