At this stage upgrades generally only seem to clearing due to people getting COVID in the week before their flight or failing a pre-departure test.

I’m booked NZ6 on PE 18 May on a 789 with code 2 (increased BP and PE cabin) and I can’t select a seat. EF shows all seats already taken (not blocked) and they’re still selling 1x U seat for that flight. Tells me they’re overbooking quite a bit with a pretty steady cancel/no-show rate from T-7