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You still have time, but you better hurry. Registration opened yesterday, April 15, and ends April 18 at 2:00 p.m. Pacific time. Cost is $900 per person and you have to use Google+ and Google Wallet to sign up, which is probably not an issue if you are interested in Google I/O.
Here’s the link to Google’s registration and help page, which should provide any additional information that you need. Have fun!