Well, they've updated the "Leaving Australia" page on Home Affairs to now include the following:
COVID-19 vaccination and travel exemption eligibility
As COVID-19 vaccination programs become available worldwide, the Australian Government is considering options to recommence international travel. This will be a gradual process informed by expert health advice.
Vaccination status does not currently determine or influence the outcome of a travel exemption request. Exemptions can only be approved if you meet the guidelines for a discretionary exemption, or meet an exempt category.
Home Affairs brings together Australia's federal law enforcement, national and transport security, criminal justice, emergency management, multicultural affairs, settlement services and immigration and border-related functions, working together to keep Australia safe.
covid19.homeaffairs.gov.au