Online forums can be a great source of information.  They can also be full of rubbish.  With the introduction of the split scimitar tips on the 737 fleets, Southwest was an early adopter on their 800 series jets.  However, I read that they had not been happy with performance and had stopped adopting them.  They definitely weren’t going to have them on the 700 series.  Above is a 700 series with split scimitars.  A number of airframes have now been fitted including this one so I guess those people were not the most accurate source of info!