There is only one of these per week. Going from the fleet blog, it looks like a reduction in hours.
SYD-NRT have to go a A330 once the B747 fleet is down to 9 (assuming that all current long haul routes stay). The A380/B747 fleet is going to be stretched fairly thin operating the following:
BNE-SIN will probably revert back to an A330 as B747s are retired.