From what I have heard,
The acceptance to melbourne was not an acceptance to the job itself. Melbourne was another test/interview for them to weed out the less competitive. You are only hired when you start training in Sydney (pass the melbourne course)
So, even though some of you got the conditional offer, it was more of a conditional offer to go through to the next stage.
That said, I do feel for those who did not get in
, and now looking for a job in this tough time in the industry. However, stick it out
and your reward will come soon.