Coral ,I really don't know. I hope that it is part of the NAS- so that all of our non radar towers will have harmonised simple procedures.
Of course if it is to go to ICAO D with no differences filed our GAAP airports are doomed.
Now the people in the CASA OAR would know this so it is interesting they make no clarification.
The OAR won't even answer my letters so it's unlikely they will tell me what their real intentions are.
My suggestion is that someone phones them and puts the answer here.
Surely it can't be a national secret.