I haven’t come across a single source for this data yet. You could try and collate the data yourself from big developer sites that advertise new “communities” but it’s post the initial land release.
realestate.com.au has a page dedicated to this – https://www.realestate.com.au/new-land-estates/list/
Here is another one, however it is only for NSW – https://www.landcom.com.au/