Not a new track, but i really wish that New-York Street Circuit would come back and just maybe for the better Insomniac would help PD with it, because that will bring the best of that track and capabilities of ps5, i guess. But this collab won't happen, so i just have a wish for the track.
I think the more likely scenario is that we'll get the Formula E circuit based in Brooklyn, as I recall PD/Kaz expressing interest in bringing Formula E to the series. Something to note is that the GT4-era NYC circuit was based in Manhattan, whereas the Formula E circuit is in a different borough of NYC.
Personally, I think Formula E's circuits could be a great way to have more city circuits, sometimes even in the same locations as in the city circuits in GT4, including Hong Kong and the aforementioned NYC.
With all this in mind, I'd love the Dubai Autodrome as another real-world circuit, as we don't have any circuits (real or original) from that part of the world, plus there's the famed Dubai 24h. For similar reasons, I'd include Kyalami as well as Phillip Island.
Yeah, I feel like PD generally does trend towards having circuits (either real or original) based in as many parts of the world as possible, even if there are some exceptions. For example, the inclusion of two real-world circuits based in California, between Willow Springs and Laguna Seca - and yet I still want Sonoma on top of that! That's also not including the original circuits seemingly based in California, with Blue Moon Bay and Special Stage Route X. But other than Sonoma, I think that'd be enough for California, haha!
EDIT: I really do look forward to some of the original circuits, not only for what locations get used, and not only what their actual designs end up being, but also the fact that they'll be free from licensing issues - which should ideally make them much more likely (if not outright guaranteed) to appear in future GT titles.