Australia is an outlier among OECD countries with its voluntary merger regime, but that looks set to change following recent proposals from the country's antitrust regulator. The Australian Competition & Consumer Commission is calling for, among other things, a mandatory, suspensory regime, an expanded substantial lessening of competition test and factors to be considered in reviews, including data access. But the finer details of a new merger regime remain to be seen, leaving questions around issues such as timetables for reviews.