The training plan does several things that surprised people. First, and foremost, they're taking more planes than pilots initially, and using most of the year to transition many people over to the 717 on the AirTran side of the partition. (only 168 pilots TOTAL will transition to SWA next year and they're taking 22 planes out of service by mid-Dec 2012).
Secondly, that will trigger a reduction in flying (and therefore, pay), on the AirTran side sooner than was expected. Most people will be close to guarantee by the end of 2012. (I'm thankful we were able to get an increase in guarantee negotiated into the agreement).
Lastly, it appears to draw out the transition longer and leave the 737's on the AirTran side longer, operating more international flying using code-share to connect SWA passengers to AirTran international flying. It's rumored that there's hiccups in the new reservations system that are pushing that delay, but it means a much slower transition for the 737 pilots (except MCO and MKE pilots since they're eliminating that 737 flying in 2012).
So, in essence, many people bid 737 because they heard those planes were going first and wanted to get to SWA and your TFP rates sooner than later. Unfortunately, it looks like that will be significantly delayed for ATL-based 737 pilots, by up to a year in some cases over what was previously anticipated and discussed.
Just a bit of a shock for those expecting a faster transition of our 737 pilots to SWA... Surprised me, too.