So far only indianapolis 2012 is in the game and driveable. Judging by the game files a new version is coming though (and it seems to include the oval as well) but if it pops up anywhere in the game at the moment thats just a bug. When you try to drive there the game will realise that track doesnt exist (yet) and will just load the first track (alphabetically ordered) which happens to be autodrom most
I'd love to see more USA oval/road combos. Daytona and Indy perform very well for a racing title that does not focus on Oval mechanics. I wish I could say the same for games that only focus on ovals and still can't get it right. Charlotte, Texas, Homestead, WWT come to mind. Pocono has some fun infield layouts for smaller cars. I just learned about Calder Park in Australia which looks like a blast.
To mimic one of the last online comps, I ran the Camaro GT3 class at Daytona oval. It was a lot of fun. The FRUS is great too.