There has been some renewed talk about bringing Formula One racing back to the United States in a couple of years. During Speed TV's coverage of the race at Spa last weekend, pit lane reporter Peter Windsor said that this renewed interest is mainly being driven by the manufacturers. Apparently they want access to the lucrative US market.
Windsor asked F1 boss Bernie Ecclestone about the rumors and he confirmed that a number of venues were being talked about. Windsor speculated that Ecclestone's preferred location was Las Vegas. Bernie does have a thing for desert racing (see Kuwait).
Living in Florida, I would have to endorse an F1 race in Miami. I would also get behind a race at the historic home of the USGP, Watkins Glen.
This story from crash.net says that Indianapolis is not being considered. Tony George says he's not been contacted by Formula One Management about hosting the event at IMS again.
It does seem clear from the intensity of the rumors that a United States Grand Prix is coming.