Not sure anything's really decided yet...
Quote: (Source: Thai National News Bureau Public Relations Department - 08 August 2006)
Next week, the board members who are responsible in developing Suvarnabhumi Airport will have a discussion on the possibility of this issue. Three alternatives will be discussed, and they include the transfer of all domestic flights, the transfer of flights that do not fly abroad afterward, or no transfer at all until September 28th. During the first two weeks, limousines in Suvarnabhumi and Don Muang will provide free services to the commuters.
Taxi drivers will know when the new airport opens, hence "Airport" will be sufficient. Do you say "don mwang" now? And they'll take you to the new airport because the fare will more. FWIW, there is a town in Thailand called Suvarnabhumi (sawannapoom) so extra efforts might put you far, far away from the airport.
