I'm in Brisbane, but when I got my offer, all the courses I was offered were in Melbourne. I know at least one of the guys on my assessment day got a Brisbane course. Don't expect that because you live in Brisbane, you'll get offered a course up here, you might get a course with a guarantee of being posted to Brisbane Centre, but you still might have to relocate for training.
It's one of the things you have to consider when you go for the job. If you're on a good wage now, are you going to be able to afford to relocate to Melbourne and pay rent for a year on the wage they're paying trainees?