I had a transatlantic flight on B class, added 35,000 miles and was pending upgrade to business. Got cleared 24 hours before departure.
Today I used my SWU for an upgrade on another transatlantic flight and they mentioned on the phone that most likely I'll be cleared on the gate before boarding but bam I just got upgraded again 24 hours before departure.
So I guess that either I'm lucky, or the flights I'm on are really empty? :-)
Either way I'm happy I'll board the flight tomorrow night and go to sleep zzzzzzz instead of being stuck in coach