I would say FOTA will adhere to current circuit safety standards and regulations. This is the list of Class 1 Formula One circuits, that is, tracks able to run F1 races, as of 2006 (sorry, this list has no newly certified tracks, like Valencia), :
- Albert Park
Bahrain
Bahrain-Paddock Circuit
Catalunya
Dubai Full Circuit
Fuji Speedway
Fuji Speedway - Short Layout
Hockenheim Grand Prix
Hungaroring
Imola
Indianapolis Grand Prix
Interlagos
Istanbul
Jerez
Magny-Cours
Monaco
Montreal Gilles Villeneuve
Monza
Mugello
Nürburgring Grand Prix
Sepang
Shanghai International
Silverstone Grand Prix
Spa-Francorchamps
Suzuka
As explained, A1 ring "recovery" was stopped by environmental reasons.
Just in case, the list of Class 2 circuits is the following one. They could be updated or recertified in some cases, but I'd say they have to hurry up: the circuit built in the shortest time in history (if I'm not mistaken) was Hungaroring, and it took 8 months to build it. Of course, this tracks don't have to be built from the ground, but...
- Albacete
Assen National Circuit
Autopolis
Bilbao
Brands Hatch - Indy
Brands Hatch Grand Prix
Brno
Catalunya Short Circuit
Denver
Dijon-Prenois
Donington Park
Durban
Eastern Creek
Edmonton Finning International Speedway
Eurospeedway Lausitz Dtm - Strecke
Eurospeedway Lausitz Oval
Fundidora Park - Monterrey
Gold Coast Indy - Surfers Paradise
Hockenheim Special
Jarama
Laguna Seca Monterey Mazda Raceway
Le Mans 24 Heures
Le Mans Bugatti
Lime Rock
Mexico City - Hermanos Rodriguez
Miller Motor Sports Park
Mine Circuit
Mosport
Most
Norisring
Okayama
Oschersleben Motorsport Arena
Pau Ville
Portland
Qatar - Losail
San José
Sears Point
Sebring
Sentul
Shanghai International Track 3
Sugo
Tokachi
Tokachi - Short Layout
Toronto Indy
Twin Ring Motegi Grand Prix
Twin Ring Motegi Oval
Umbria-Magione
Zhuhai
Zolder