There are numerous mentions of the word 'waitlisted' for an upgrade in this thread. Mainly from US based travellers, which is understandable as this is the norm there.
The only 'waitlist' for miles upgrades I am aware of, is the 'auto upgrade' feature. Am I missing some other way to get 'listed' for an upgrade? Or are we all talking about the same thing but in a different 'language'?