OJB is now 2 class. All the older 744s are eventually to be converted to 2 class with the newer 744s becoming standard on the LHR and HKG runs and the 744ERs on the MEL-LAX-ORD and SYD-LAX-JFK runs. LAX will still occassionally see OJB as BNE-AKL-LAX is a 2 class service.
I think this means that Wunala will not come to MEL anymore unless it is operating a domestic sector as the only int'l 744s that come through MEL are 3 class. Since the Rome service stopped originating in MEL, Nalanji has also been a very rare visitor though this may change as more 743s appear on the domestic network.
It will be interesting to see if QF put a special livery on any of their 3 class 747s or whether they will wait until the A380s arrive.