I have an incomplete understanding of the recent changes: I understand that new bookings book into Latitude K and aren't upgradeable unless there is R space, which is rare. But I am lucky? enough to still have the inbound leg of a Latitude B booking available and am confused about what to expect when I go to change it. I booked with WWCP, so have to call in to change and want to make sure my expectations before doing so are accurate.

I'm expecting to pay a minimal fare difference at most and have the same upgradeability as any other Latitude B booking. Does that match others' expectations as well? Thanks!