Some more info:
http://www.qantas.com.au/agents/dyn/qf/info/201402/0218
Qantas and South African Airways are winding up their codeshare agreement, effective 31 May 2014.
Qantas will remove its 'QF' flight numbers on South African Airways operated flights between Perth and Johannesburg (PER-JNB v.v.) effective on/after 01 June 2014.
All impacted Qantas customers will:
remain on the same services operated by South African Airways but reaccommodated from the 'QF' flight number onto the South African Airways 'SA' flight number. Apart from the flight number change, there are no other changes - the flight, date, schedule, routing/destination, class of service, inflight product and experience remain the same; or
will be reaccommodated to Qantas operated services QF63/64 between Sydney and Johannesburg (SYD-JNB v.v.) on same day of travel within the same cabin.
Travel Agents will receive a cancellation message from Qantas via the GDS schedule change queues.
The following options are available to affected customers holding a valid ticket issued on/before 21 February 2014 for travel on/after 01 June 2014.
For customers holding a Qantas (081) issued ticket:
Passengers may, without fee:
Reissue ticket from the Qantas 'QF' flight number operated by South Africa Airways that has been automatically reaccommodated to the same service with 'SA' flight number operated by South African Airways.
Rebook/Reroute travel via Sydney gateway on alternative Qantas service with 'QF' flight number operated by Qantas.
Conditions
All changes must be made prior to the original ticketed departure.
New travel dates must be within ticket validity.
All tickets must be reissued before a customer can travel. Failure to reissue a ticket may result in customers not being able to travel.
Rebooking on Qantas (QF) flights, if the same booking class is not available, the lowest booking class within the same cabin may be booked (e.g. within Business or Economy cabin)
Qantas will not be responsible for paying any other costs or expenses such as hotel or other ground operator fees arising due to events beyond our control, unless required by applicable laws.
All other rules and conditions of the ticket remain unchanged.
Customers are permitted to make changes as outlined in this policy. Any subsequent changes made after the ticket is reissued will be subject to the rules and conditions of the original ticketed fare purchased.
For customers holding a ticket issued by another carrier (non-081):
Passengers may, without fee:
Reissue of ticket from the Qantas 'QF' flight number operated by South Africa Airways that has been automatically reaccommodated to the same service with 'SA' flight number operated by South African Airways.
Rebook/Reroute travel via Sydney gateway on alternative Qantas service with 'QF' flight number operated by Qantas. If the same booking class is not available, the lowest booking class within the same cabin may be booked (e.g. within Business or Economy cabin)
For customers with unticketed bookings:
For unticketed bookings, alternate flights/routings can be rebooked subject to availability and tickets issued in accordance with fare conditions.
For customers on Frequent Flyer Award Tickets:
Passengers who are travelling on Qantas & Jetstar Any Seat Award tickets are entitled to the same options and conditions as listed above.
Passengers who are travelling on Qantas & Partner Classic Award tickets are entitled to the same options and conditions as listed above provided any travel rebooked or rerouted is made on an eligible Qantas Frequent Flyer Partner Airline and any travel booked on a partner airline is subject to award seat availability. Classic Award tickets cannot be retained in credit.