OK, the rumour alluded to last night. First though, the qualifier. I don't know the source very well and it's a bit of a circumstantial case. It's also a bit third hand.
Jetstar recently changed their promotional criteria to 'merit based' rather than seniority based and sent a notice to crew that they'll be accepting DECs. With the RIN on the 767, there are some thoughts bubbling that QF 767 crew may get an offer to go and fly the JQ 787s on JQ terms and conditions. Timing depends on the number of VRs that are accepted, 767 drawdown, etc.
Like I said, don't know the source and it's not from inside Qantas. Personally I put this up there with the 777 rumours but time will tell.