Looks like would would have been a future grand prix, the Thai GP in Downtown Bangkok, has gone to Formula E. I believe that is case closed for Bangkok - they can hardly run Formula E and Formula 1 on the same weekend and it would be a lot to ask of a city of Bangkok's sheer size to shut down the roads for a race at least twice a year. :/
http://gas2.org/2013/05/22/formula-e...ce-car-design/