I'm also doing the ATC assessment centre in Melbourne on 19th July. Haven't received any email confirmation yet but hoping it will come soon, I've been keeping an eye on my spam folder as well to make sure I don't miss it..
Also wondering if I get through all the stages and get a job with Airservices Aus, how long can I expect to wait before training starts? Put original application in early April, as it's such a long recruitment process just want to know when I'm likely to actually start the job?!