With the number of resignations from JC over the past 2 years (before this even started), that email, to me, comes across as a dangling carrot to keep flights crewed. But I'm a glass half empty kinda guy. Hope for the best, plan for the worst.
If JC "management" had any desire to retain staff they would have ratified the contract 2 years ago. If QANTAS had any burning concerns over the rate of resignations at JC, they would have intervened by now.
But instead of resolving the turnover, rumor has it they're hiring DEC's on temporary contracts instead....