ALH,
All three A300 freighters in the QR fleet used to fly as passenger aircraft (AFB for KAL and the other two in the QR fleet) (A7-AFB / ABX / ABY.) There are no plans to increase the AB6 freighter fleet but the current 3 aircraft will remain for a few more years to supplement the new 777F fleet (unless of course the bottom falls out of the cargo market, in which case the retiral of the A300's may be expedited).