My money is on some limited international travel around July when most Aussies will have had the vaccine. Allowing vaccinated travellers with negative COVID test results in and out of Australia will probably be an acceptable risk if data gathered over the next few months provides good news. It won't be back to normal, a handful of detinations with smaller aircraft at best but hopefully there will be a start.
Australia can afford to wait and see as it is less dependant on international travellers than countries such as Thailand. It can sit in isolation at the end of the world as it has done for thousands of years and watch while other countries take the first steps.