There's no Nurburgring, Infineon, or Suzuka circuit. Sounds incomplete to me.
Also, let's be honest here, it's a console racer. If I wanted 100% track precision I'd be playing a simulator on the PC. Make the curves right, call it a day, release it with the tracks. Otherwise it's just an excuse for more DLC.
To be honest, I'm gutted at the loss of Nurburgring but I'm glad they did this. Throughout the Forza's Turn 10 had a habit to not re-draw assets which visually made some parts of the game more pretty than others. Maple Valley in FM4 for instance.
The fact that they've dropped assets out of the game which haven't been redrawn makes me happy, all the tracks and cars are correct for next-gen.
If they laser scan Nurburgring with the F1 track, definitely buying.