The terms on the website for the upgrade are now very unnecessarily vague...

Complimentary upgrades are offered with the Latitude fare option only and are subject to availability. Seats may not be available on all flights, all days.

If they restrict the upgrades (i.e a number less than J), that's pretty much the end of the pass situation for us...You would never know the chance of the upgrade until you called in 24 hrs before. Using certs, I would just buy Latitude fares because then I could do everything online instead of having to call in everytime I wanted to use a cert. If I=0, I would just buy J or C if I really wanted J...

This seems to be a different situation than the COS bonus as that was never stated in the T&Cs that I can remember...but complimentary upgrades were a given if J space existed.