Penny Arcade proprietors, Mike "Gabe" Krahulik and Jerry "Tycho" Holkins during a Q&A session that the PAX show is coming to Australia. They didn't stop with the good news there, also announcing that PAX Prime would last an extra day next year, increased up to a 4-day event.
Another thing that has been teased, is that PAX might drop by the UK in the near future, and it's something that Penny Arcade are definitely thinking about. Someone from the UK asked Krahulik, to which he responded "we want to go there".
There's no news on the UK event, but I'm guessing that if the Australian event goes well, we should see a PAX UK event, too. You can be sure that we will probably cover the PAX AU event, so keep checking back!