It should be noted, and you can be as skeptical as you want with what Watchtower says but they do indicate (Dates indicated were as of July 20, 2015):
In the last six months in South Australia, elders have been directed to report three separate instances of alleged child sexual abuse (two of which concerned sexting) to the secular authorities using the Child Abuse Report line.
In Victoria, the elders were directed to report a matter to the police involving a sexual offence committed against a 15 year old. Additionally, last year in Victoria, the elders were directed to report a matter involving child sexual abuse unless they could satisfy themselves that the matter had already been reported to the police.
Of course the timing of those reporting cases could be indicated by the fact that they were going to be investigated by ARC but at the very least the ARC is forcing Watchtower Australia to report it which is a benefit and not a determinant to law enforcement.