It is a shoe-in that DJ will get this IMHO.
CO and NW and AA have rights to SYD - they choose not to use them AFAIK. (All 3 used to of course.)
Virgin will in essence be a true round the world airline if this comes off as Virgin Atlantic fly LHR-HKG-SYD
Where will they get the panes? The Arizona desert parking lot is covered with 747/400s that have not flown for years.
Many are still in UA livery in fact.