Well it seems QF have taken the biggest punt in the game right now.
There are no plans to fly any four engine aircraft. The last 380 reconfiguration is being completed as they were already contractually obligated to do so. A deal has been made with airbus for an early delivery on 10 X 350s due to other carriers pulling the plug. Fasten your seatbelts. Post-COVID will see one hell of a RIN and extremely likely job losses.