Google just put up a Web site for the 2012 Google I/O conference.

This year, it's going to last a full three days - June 27 to 29 - in San Francisco's Moscone Center. Past events have taken place in May, and have lasted only one or two days.

The event is for developers, but Google also uses it as an opportunity to unveil major projects for the coming year, like Android (first demoed at I/O 2008), Wave (2009), and Google Music (2010 and last year). It's also one of the rare times that a bunch of Google execs all speak in public, although Larry Page has been a no-show recently, Business Insider reported.