EDIT: Appears Qantas will be staying (at this stage), with the days it flies to HNL changing:
Qantas will operate Sydney to Honolulu departing Sydney each Wednesday, Friday and Sunday.
(So almost daily services)
That's going to change to a 767-300 operation for sure (like it has on/off in the past). There is no other suitable aircraft and the 747-300 will be far too large after JQi commences flights.
Regards