Just checked Friday 06DEC19 UA1910 IAD-LAS and it looks like the upgrade list has every Silver and above listed. Both my name and my same PNR traveling companion are on the list without being checked in. Doesn't look like I'll be getting CPUd unless there's an equipment swap to a plane with dozens of first class seats
I checked a 31DEC19 flight using the phone date change "trick" and I'm already on that upgrade list too.
It's nice to know where I stand well in advance, so I wouldn't mind if this change is permanent.