So after doing some research, it appears that Sync isn't supposed to default to BT. They apparently changed that a few updates ago due to complaints from users having their cellphones go dead because they would automatically play music when they started their vehicles.
My '10 was still using software old enough that it would default to BT, but now after doing this most recent software update, it only defaults to "line in". Lame. It's nice having the track info, but I'm not sure it was worth losing BT default. Would be nice if they gave an option for defaulting to one or the other in the Sync menu with another update. This is just as stupid as the truck shutting off when opening the door after using remote start, but at least that was easily fixed by reprogramming the remote start brain.