Google I/O is totally sold out. Blame it on things like Android 5.0 Key Lime Pie, Google Glass and Google Now, all of which are expected to make their presence known at the event.

Tickets to the conference, held annually by Google in San Francisco, went on sale at 10 a.m. EDT on Thursday March 14 and quickly sold out in less than an hour. For those not lucky enough to grab a ticket, Google will be live streaming parts of the event on the Google Developers Live @ I/O site, which can be viewed on PCs, smartphones and tablets. Talks will also be recorded and posted online after the event.

"Google I/O is hot partly because Google's hot," says Principal Analyst at Sterling Market Intelligence Greg Sterling. "It's also a place where Google makes big announcements and where developers get access to Google personnel and engineers ... Google stock is hitting new highs and it is right now perceived as the company that has tremendous momentum - especially in mobile."

Google's conference will be held at the Moscone Center from May 15 to 17. Tickets were offered for $900 to the public and $300 for students. Last year the event sold out in about 20 minutes.

It's still unknown what exactly Google will have to offer at the I/O conference, but you can bet on seeing the new Android 5.0 Key Lime Pie. Google Now and a new Nexus 7 are also strong possibilities. We'll also likely see a lot of Google Glass at the event, and maybe even Google Stores. It has been rumored that Google is working on its own line of retail stores to show off its hardware.

At Google's 2012 I/O conference, the company demonstrated Google Now, 3D Google Earth imagery, Google+ Events, Chrome and Google Drive and iOS and a new YouTube app. The highlight of the event was Sergey Brin's demonstration of Google Glass, where skydivers wearing the augmented reality glasses landed on the roof of the convention center.