For Formula one this might be a future venue
And that set aside, it has to be graded again. So in effect it is now a venue without a racing calendar stuck to it. Making it a possible future venue (again).
That being said, I am afraid that if we are only going to discuss future venues being built, this thread will be very short. There simply are not many circuit builds going on across the globe at this moment. Not ones who do not have Grade One certification in mind. Spending some tens of millions of Dollars on racing tracks without a possibility of a Grade One certification, is just pouring money down the drain. So either it are circuits that have a possible certification in mind, like the Kymiring. Or it are tracks, like the mentioned one in the OP, that have (a big) domestic racing (series) in mind to cater.
I can not imagine this circuit in Tennessee being built, certainly not when it is this massive, without having certain series in mind to cater. Regardless of what the article states that they are in negotiation. Such an investment of building this specific track is easily 100 million Dollars and no investor will commit to that without any (financial) security to protect said investment.
Hence why I think this will be a short or slow thread. That being said.. You are all very welcome to get me surprised otherwise. Because I am always in the mood for some discussions about new venues.