Risk Magazine reports that “Central bank decides not to actively encourage the (re)creation of a repo-focused central counterparty, but says it will work with the industry if it wants to take the project further.”
See also this consultation paper from March 2015 from the RBA: http://www.rba.gov.au/publications/consultations/201503-central-clearing-of-repos-in-australia/australian-repo-market.html