Expect your entry and exit requirements for most countries around the world to change once you're allowed back out there. If and when a vaccine is found and distributed, you can expect to have to prove you have had it in order to enter a foreign country, in the same way you're already required to be vaccinated against yellow fever in some places.
With or without a vaccine, you can also expect to have to provide extra detail in terms of your planned whereabouts and contact details upon entry. Contact tracing is an important weapon in the fight against the spread of infection, and governments are going to want to know where you've been and where you're going. Some countries might also require you to download a tracing app, similar to Australia's COVIDSafe.
