I just got the following email:
June is our birthday month but we're giving YOU the gift! Your flight on June 27, 2013 has been selected to receive FREE TV compliments of Southwest! Using your own WiFi-enabled laptop, tablet or smartphone, you will have unlimited access to our lineup of live channels and on-demand television shows at no cost. WiFi access and movies are also available for purchase on this flight.

For a list of compatible devices please click here.

Once onboard and the Flight Attendant has indicated it is safe to turn on approved WiFi-enabled devices, simply select "Southwest WiFi" from the available wireless networks and launch your web browser to be directed to the Southwest Airlines Inflight Entertainment Portal. From there you can access free TV, track your flight or purchase WiFi and movies.
WiFi, TV and Movies are all offered separately. You do not have to purchase WiFi to enjoy TV or movies.
Pricing for WiFi and movies will be displayed on the Southwest Airlines Inflight Entertainment Portal once you connect to the wireless network inflight. Access to free TV will also be accessible through the portal.
Should you change your flight, have a connecting flight, or if operational circumstances result in an aircraft swap, please note that the alternate aircraft may not be equipped with WiFi, free TV, and movies.
For travel to/from San Juan Puerto Rico: WiFi, TV and movies are not currently available for the entire duration of your flight.
Remember to bring your fully charged WiFi-enabled device and headphones along so you can take full advantage of this exciting offer.

We look forward to treating you to free TV on your flight!

- Your friends at Southwest Airlines