We knew that PAX Australia was a thing, but we weren't sure where it would be held until now. It was just announced that Melbourne will be the home of PAX for 2013 and 2014. The Melbourne Showgrounds will host the show from 19-21 July, 2013.
The official site has been updated with the new location. It also features a countdown timer set for 270 days as of today. I have that long to figure out if paying 7 bazillion dollars for a plane ticket to Melbourne is worth it.