I called.  It's a time share vacation program that requires the attendance at a meeting.  In return, you get a voucher for the flights and hotel stay.

received a "Congratulations!" postcard with this number on it.  

Claims you're "going to receive 2 Round Trip SouthWest Airline Tickets to any major city in the continental U.S. plus a 3 Day / 2 Night Marriott Weeknd Getaway!  Call within 48 hours.  You will also receive as a bonus a $50 Travelocity hotel cash gift card!"

I didn't bother calling.