The flights will be crewed by the number of pilots required - that is it!
The only reason QF currently run more than 2 crew from SYD-SIN is that the S/Os need to get to SIN for the Europe sector anyway so they operate instead of passenger. If the tools in power wish to change things they should do it in accordance with the fatigue study done a few years ago rather than the dangerous practices of a few other airlines.
