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Apple CEO Tim Cook speaks during an Apple special event at the Yerba Buena Center for the Arts on September 12, 2012 in San Francisco, Calif. - 

Apple will unveil new hardware and software at its live product announcement event on Tuesday. Eric Limer, staff writer at Gizmodo, joins Marketplace Tech host Ben Johnson to give a preview of what to expect. 

Click the audio player above to hear more. 

Follow Ben Johnson at @@TheBrockJohnson