I'm in the 8:01 group that made it to Anchorage today and will be heading to KY overnight. I realize we've all heard a ton of conflicting info from many sources, but this was just emailed back to me from UPS after asking if they might have Saturday delivery even with the standard Express Saver.
Here is what they wrote:
If the package reaches the center in enough time and we have the staffing and capability of a Saturday delivery, we will do our best to upgrade the packages. If it is upgraded, you will see a "Saturday Delivery Upgrade" scan entered into the system.
So, there ya go... something else to ponder! Basically don't depend on it...