Qantas has made no secret about seeking circa 70 S/Os in FY16/17. There are approx 100 former cadets and LOI holders who are going through the assessment process at the moment. If they're all suitable then obviously it's going to be at least next FY before DE intake pilot slots will become available.
Of course this is aviation and many things change. My understanding is that Qantas has multiple 787 slots potentially turning up 'much more quickly' from 2019 onward- almost one a month was a rumour I heard- IF Qantas converts the fixed date/ cost options into firm orders. Whether they take them, what aircraft they may retire in the interim, etc are all the great unknown.
So I'd take Littlebird's advice on this one. Continue with your career and if Qantas happens to feature in there somewhere then that's even better.