The stations also have to be considered full power to force must carry, and of course with the deal Dish/DIRECTV made with the FCC they have until the end of 2012 to have all the stations carried.
I suspect that they are nearing the completion of adding new HD markets. The pace will slow down a lot and they will start going back and filling in all the markets that they have room for currently. They have a couple more satellites to launch to have enough capacity to fill in every market.
XETV also used to be Fox and remained even while KSWB took on Fox.