After former Yahoo! CEO Carol Bartz was confirmed and then cancelled to speak at CES in 2009, there has not been a keynote speaker from the tech company since. That is until the Consumer Electronics Association announced that Marissa Mayer will deliver a keynote speech at the 2014 Consumer Electronics Show. She will speak on January 7 and discuss "vision for products, services, and networks that will shape the next wave of innovation."
Source: The Verge