pagingjoan, the cancellation of QF94 from LAX to MEL on Friday night (normally due into MEL on Sunday morning) may be a contributing factor.
The scheduled Friday night QF10 from LHR departed at 0122 on Saturday morning (three hours and seven minutes late) but picked up a lot of time on the slack timetable to arrive Melbourne only 97 minutes late at 0902 this morning. It normally forms QF93 which managed to be off blocks only 13" late at 1133.
So by my reading, QF may be one A380 short in MEL as we speak. Perhaps it is deadheading one down from SYD?
By the way, an 1830 hours departure for QF9 is a delay of 135 minutes, not 165 as it is normally due out at 1615 from MEL to DXB. The QF computer claims that it should arrive LHR only 90 minutes late (assuming an 1830 hours departure is achieved, which none of us yet know) which again shows how slack these schedules are given normal wind and other operating conditions. This extra fat in timetables allows airlines to claim a much better 'on time performance' than would be the case if the timetables were accurate.