"This year we’re making some changes to registration, so you won’t need to scramble the second registration opens. We'll be implementing a new system, where you can submit your interest to attend Google I/O 2014. Successful applicants will then be randomly selected and notified shortly thereafter."-Sundar Pichai, SVP, Google
As usual, we expect Google to launch its Google I/O app a few weeks prior to the show. The app helps those attending get from place to place without getting lost, and allows those who can't attend, view live streaming video of presentations made inside the rooms. For those who will actually be attending, a new feature last year allowed your device to scan the badges of other attendees using NFC, thus allowing you to network on the go.
source: +SundarPichai, GoogleI/O via SlashGear