It’s interesting that they waited an extra month to program their schedule, but they’re publishing it three months farther out than they’d previously led customers to believe.
And it’s useful to know when the schedule becomes available for access to the cheapest fares on presumed peak travel days, such as July 4th weekend. Southwest hasn’t had change fees, even before the rest of the airlines jumped on the bandwagon for some fares and certain flights. So you can book forward-looking cheap tickets if it makes sense and retain flexibility.