Google just announced the dates for I/O 2012: April 24-25
googlecode.blogspot.com
googlecode.blogspot.com
The talks are worth well more than the $450 admission price, though, so I wouldn't be heartbroken in the least if I came home emptyhanded after all.
That was not fun for some colleagues of mine who spent the better part of an hour trying to get the registration site to generate actual pages instead of ColdFusion error messages.