Just logged in to my RR account and see under "my promotions" the following:

Earn Double Points On Weekend Travel
Details

Enjoy a quick weekend getaway* and earn twice the rewards! Taking advantage of this offer is easy:

Register between April 7, 2014 and April 10, 2014.
Book your roundtrip travel through Southwest Airlines® between April 7, 2014 and April 10, 2014.
Complete your roundtrip travel between April 11, 2014 and April 14, 2014.

Register and book your roundtrip today!
Terms and Conditions:

*Saturday night stay required on April 12, 2014.

Only the Rapid Rewards Member who received this offer from Southwest Airlines® is eligible for this promotion. Offer is nontransferrable. Member must register for this promotion between April 7, 2014 and April 10, 2014, and registration must be completed prior to commencement of travel. Valid on a new reservation booked within the promotional time period. Member’s flight must be booked through Southwest Airlines on a single reservation between April 7, 2014 and April 10, 2014. Member’s flight must be completed between April 11, 2014 and April 14, 2014. Valid only for a one-time double points bonus on a roundtrip flight booked and flown within the promotional time frame. Rapid Rewards account number must be entered at the time of booking. Member will receive 12 bonus points per dollar spent on Business Select® Fares, ten bonus points on Anytime Fares, and six bonus points on Wanna Get Away® Fares. Bonus points are in addition to the standard flight points earned through Rapid Rewards. Bonus points will not count toward A-List, A-List Preferred, or Companion Pass qualification. Member will receive bonus points within seven days after completion of entire ticket. Award, Companion Pass, Southwest Vacations® Packages, Jackpot Deals®, and reward travel do not qualify for this promotion. Changes made to the itinerary after purchase may eliminate qualification for promotion. Southwest Airlines operated flights booked through AirTran® Airways are not eligible for promotion. All Rapid Rewards rules and regulations apply.