If the rumour has legs, the most likely scenario would have QF take a number of relatively new 767s and pass more A330-300 to JQ pending delivery of JQ 787s.
That allows JQ to start ramping up International flying in line with the original plan.
What happens when 787s appear depends on the "new" 767 lease arrangements; either they are returned on a one for one basis, or "old" 767s which are approaching Heavy Maintenance visits are released closer to original plan, and the "new" ones are the last to go in five or seven years' time.
Pure speculation based on a rumour. What Pprune does so well.
