F1's favoured track designer Hermann Tilke will pen the new US Grand Prix circuit in Austin, Texas and a site for the track has been decided on but not made public.

A lawyer for the race's promoter Full Throttle Productions is quoted by the local American-Statesman newspaper revealing that land has been secured.

"We're just not ready to disclose it [the actual location] yet," said Richard Suttle. He also said regular F1 circuit designer Hermann Tilke has been appointed.

But even with the new details, doubts about the project remain, including insider sentiment that it resembles past negotiating moves deployed by F1 chief executive Bernie Ecclestone. Until the shock news of the Austin deal emerged, Monticello Motor Club in New York was considered the front runner for a contract. Club president Ari Straus said the 2012 start-date was the biggest surprise.

"Somebody starting from scratch would not be able to do it until 2013," he said.

The implication could be that if Austin is unable to be ready for 2012, Monticello could be back in the frame for a project the following year.

"If Bernie comes back to the table," Straus said, "Monticello is ready."

But Austin promoter Tavo Hellmund, reportedly a friend of Ecclestone's for decades, said he is not worried about the tight schedule for 2012.

"If it [the date] slides back, it slides back," he said.

Although mainly funded privately, the project will also enjoy some state input, with a letter to Ecclestone signed by Texas governor Rick Perry pledging $25 million per year from the state's Mayor Event Trust Fund.