Southwest has not released specific service details, saying only that it will add at least two daily nonstop flights from Northwest Florida to four destinations across its 68 airport network for a total of eight daily nonstop flights when it begins service next year.

Northwest Florida will be the first international airport to open in the nation in more than a decade. The new international airport is currently under construction and is scheduled to open in May 2010. Specific details on Southwest's fares and schedule will be available in December 2009.

Full press release available here:
Southwest Airlines Announces Service From Northwest Florida’s New International Airport, Near Panama City, Florida