There are some major changes in the 2016 national census which Australians will complete on the 9th of August. Aside from being the first digitally-focused census, there are changes to a key question and how personal information will be retained. That has raised security and privacy concerns. - There are some major changes in the 2016 national census which Australians will complete on the 9th of August. Aside from being the first digitally-focused census, there are changes to a key question and how personal information will be retained. That has raised security and privacy concerns.