longreach,
773 is on as a 743, old 744 replacement, and as a hub feeder to the A380.
772/ER/LR is not being considered in any form, it carries less cargo than the A333. A340 is still being looked out where a 4 engine aircraft is more econimical to run on thinner routes or where ETOPS is a problem. 777 will need to gain in service history within QF to get CASA ETOPS approval for it to do the work as a 747 replacement.
A340 has other operational efficiencies over 777 as crew could be on a mixture of long and short haul rosters between the A330/A340. The A330 simulator is also an A340 simulator, crews can cross qualify.