I think that is a major problem in Polyphony's marketing, and will hurt the game, if tracks are appearing after the announcement of the game. It is because people made their minds up after the presentation of Gran Turismo Sport.
To be fair, the original tracks could show up in Gran Turismo Sport. My expectations of that are extremely low. It is because of all the promises Polyphony has made, and has failed to deliver. Gran Turismo Sport is an E-Sports game sanctioned by FIA.
Gran Turismo Sport looks to be a nice looking game, but I am not going to buy it. I am a long time fan of Gran Turismo and have bought every single game, but I don't find Gran Turismo Sport compelling enough to buy, unfortunately. I will have to pay to access the online functionality, which I have no desire to do.