sjonly1,
I believe it's just an email if you're unsuccessful.
I see from your previous post that you did your assessment the same week as me in Brisbane. I know one of the guys from the Tuesday has already received and email last week saying he'd missed out. Of the guys that were assessed on Wednesday, four of us haven't heard anything, but two of those four have had their referees contacted. I don't know if mine have been contacted. I got an email on Monday from Airservices to say I should hear something next week.