Gents,
SBAS has not been introduced in Australia. The signal is a trial signal and will not be used by certified avionics. The aviation trial is being conducted using non certified systems to demonstrate benefit to Gov't.
Dick, the purpose of the trial is to let all industry sectors try SBAS and develop their own cost/benefit studies. This will be put together by GeoAus for a nation wide cost/benefit study to aid the decision makers on SBAS post trial.
Bograt, the release information is correct.
Vref+5 you are incorrect in your assertions on AsA.