Good news everyone! Blizzard had originally planned to lock Australian StarCraft II players to the Southeast Asian servers, making it impossible to play with a larger English speaking community on North American servers. Recently however, they announced via the game's official Facebook page that they won't be region-locking Australian players to Southeast Asian servers after all.
While going back on their decision, Australian players won't be able to play on North American servers immediately after launch, but will be allowed to do so within 60 days of it. Access to European and Korean servers will still be restricted.
Unfortunately though, it won't be as simple as 'switching' servers. Players will be required to download the North American StarCraft II client to change the region, and we should also note that players stats are dependent on region, so these won't carry over when players switch between the different servers.
Blizzard scraps region-lock for Australian StarCraft II players [Gamespot]





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