Google has just announced via their Developers Google+ page that Google I/O 2012 has been moved and extended from a 2 day event in April to a 3 Day event in June, the 27th-29th of June to be precise. The event will still be held at the Moscone Center West in San Francisco. Google are seeking input as to what to show on the third day, they`re welcoming input from attendees here.
So just to re-iterate, Google Australia, if you`re listening, I am free to attend on those dates, you`ll just have to supply a Google I/O ticket and airfare.
Source: Google Developers.