There are actually a good number of American complexes in the game - 5 in total. However, only one of them is a real-life location: Willow Springs.

There are a few venues that need to be added to really capture the essence of motorsport: Indianapolis; Silverstone; Spa-Francorchamps; Monaco. We got Nurburgring and Circuit de la Sarthe, we are only missing a few more.

Daytona, too. That's a big one.

Virginia International Raceway anyone? There's a few different configurations, and I've had the pleasure of driving the Grand East version myself! :D

As much as I know it will have a very slim chance, but I would love for Polyphony to bring back most, if not all of their classic tracks; Courses that have been long gone since GT4 and are loved by most fans of the franchise (such as SSR 11 and the entirety of GT4's original circuits that disappeared before GT5).

I would also love to have more street circuits: Long Beach, St. Petersburg, Monaco, Melbourne, Baku (at a big stretch) to name but a few. GT4's street circuits would also be appreciated (New York, Hong Kong, Seattle).

Maybe a couple of other F1 tracks as well (Spa, Shanghai, Donington).

maybe batangas racing circuit from the philippines, my country. would like to see our country's circuit in this game.

Laguna Seca, Spe and Sydney Motorsport Park is on my list. These and Deep Forest, Grand Valley, Trial Mountain and Apricot Hill would be spectacular as well

Hidden tracks from past GT games wouldn't be deemed race-worthy. And Northern Isle Speedway Festival tracks are pretty much the de facto of Gymkhana, so to add hidden tracks like Round would be rather illogical for racing purposes (they would've been added under Mission Challenges or Driving School, but that's about really it).