Yikes! Never thought I'd be responding to this type of thread, but I'm on CO 1052 tomorrow (EWR-CUN) leaving at 7:25am. PDA shows 16 seats in F with only 6 booked... but as of now (7:45am) 0 upgraded ?? Similar story on my return Sun on CO 1011-- which also has 16 in F, but there it shows only 4 booked and 2 of those 4 were already upgraded (miles ??).
This Platinum has 97,645 miles this year, and I'm at 100% EUA, I can't believe this will be the one flight I'm sitting in coach
PS-- yeah, I know it will problably run and I'll be sipping on my bloody mary at this time tommow in 1A, but come on CO, don't make me sweat it out

Just checked again, and still showing the same, but CO is giving me the "generous" offer of using US$ 1,011 to upgrade to F for one of the available 9 + seats on tomorrows flight !!