murdoch has quarterly rolling admissions. if you aren't admitted in this cycle, you're transferred to the next cycle. not sure how long you stay in the system, though.
when i applied last year, i submitted my materials by the 30mar05 deadline and got my acceptance email on 25apr05. so give it a couple of more days before you start looking forward to the next cycle or exploring other options.
also, you can contact the international office. they're wonderful there.
best wishes...