Qantas won't tell you what type until day one as things can still change up to that point (a friend was changed the day before he started). Most training will be on the 744 though eventually A330 will have some going on. There does appear to be some movement in the system within qantas with some FO training on the 767 (though limited) and more on the A330 but none on 737.
One thing for people to consider is the possible inpact of Bird Flu a month down the track should it find a way to pass from human to human, that may slow down recruitment again for some time. My opinion having to spoken to some in the know is that there will be quite slow recruitment for the next six months then ramping up after mid year when things settle down more (if they do at all).