Not true at all. SW has yet to implement any "pay more to board earlier" fare structure, although there are longstanding rumors that they are considering doing so in the future. The changes only have families with small children "preboarding" after the A group instead of before, and now give you a number with your A, B or C that shows where within that group you will board. They are boarding in smaller groups within each letter category vs. having a complete free for all.