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Isabelle Olsson, lead designer of Google's Project Glass, talks about the design of the Google Glass during the keynote at last year's Google I/O, in San Francisco on June 27, 2012 in San Francisco. - 

Today marks the beginning of Google's three day conference for developers, called Google I/O. Last year the company unveiled its tech-boosted spectacles, Google glass. It was perhaps one of the most extravagant unveilings in tech history -- glass-wearing Googlers streamed live video of themselves jumping out of a plane and riding into the convention on trick bikes.

I/O stands for "input/output," so Marketplace Tech host Ben Johnson got some input from CNET's Molly Wood on what Google might be outputting this year. Wood says it won't be easy to top last year's spectacle.

Follow Ben Johnson at @@TheBrockJohnson