The airport in Branson that will be used for the fly-in is PLK
http://www.airnav.com/airport/KPLK
The new airport that is not open yet is BBG. This is the location of the airshow on May 8 - 10. This new airport will not open until Monday, May 11 after the airshow. This is the first privately funded commercial airport in the United States.
Plan now to attend the SOAPA meeting in Branson, MO. on May 6, 7 & 8, 2009