I've heard a different take on this rumour.
When the A321 NEO becomes available, JQ will receive them for routes to Bali, Phuket etc and JQ 787's will return to QF to be reconfigured replacing A330's on trunk domestic routes and Asia. International destinations currently served by both QF & JQ such as BKK, HNL, SIN and Japan will all go back to QF.
Jetstar becomes a single fleet airline again (as it always should have been as a LCC) and QF has the better Asian network we keep hearing about.