Dick,
Q1 Yes I am.
Q2 In the 2024/25 time frame
Q3 Not that I am aware, you just need to make sure that avionics is WAAS capable. I believe that is TSO145/146
Q4 Project is being run by Geoscience Australia as a national navigation infrastructure project. Of which Aviation is a minority user but is being consulted with. If you want to know about the project then I suggest someone at GA would be your best bet. The aviation side is straight forward in that it will mostly be a copy of the US WAAS system. There is project at Airservices running that side of things.
The reason things are quiet is because they are still at contract negotiation/finalisation stage. When that is complete, things will become clearer.
What exactly do you want to know?
Alpha.