It appears as though Australians are having difficulties logging onto Diablo III, as a result of an login loop that appears to be constantly informing players that an update is required.
When players start the Diablo III, they are kicked to the launcher, which informs them an update is required, but then the launcher says the game is up-to-date. This is despite the fact that Battlenet states that servers are live and available for play.
Apparently it's a result of the Asian servers being down, hence players can't install the patch properly — so apparently it's a regional issue. Updates are region locked, and those in our region haven't had the update properly updated, which means that no matter what server you play on, you'll still have similar issues. This can be frustrating for players who spend the time downloading a patch only to be asked to download it again in a loop.
We've contacted Blizzard locally for an update. More info as we get it.
UPDATE: Looks as though a fix for the Diablo III log-in issue can be found here on the Battle.net forums. Thanks Daniel!
UPDATE 2: Apologies — I got the details wrong on the size of the patch. Apparently the patch is relatively small — 1.02 is 60MB and 1.02a is 5MG. Again, sorry for the confusion.