I applied for the ab initio programme about two weeks ago and got the call last Saturday. Was earmarked for 'batch 8' at YMMB for the second round of testing.
My experience is limited to a few hours here and there, but I do have a Class 1 medical and am highly qualified/experienced in another field so maybe that helped. Oh and I have an equivalence cert from NSW for my Year 12 studies (incl maths).
I sent them an email on Wed declining the offer for financial reasons.
Good luck to whoever goes for it.