QF is currently very short of B744 capacity at present and is trying to acquire additional aircraft as quickly as possible so I doubt that the planned FJ B744's will come from QF. They will probably be leased by FJ direct from a leasing firm with QF contracted to do the major maintenance. Let's hope that they don't acquire any ex-BA B744's as QF's experience with VH-NLH has been very poor with many disruptions for passengers.
FJ has been looking at the A330 for a few years now and I wouldn't be surprised if they acquire 1 or 2. It's the right sized aircraft for some of their routes and QF will have all the training and maintenance infrastructure in place.