Following up on the story below, the E3 Website now officially announces the cancellation of E3 2020, with the ESA saying they are offering full refunds to exhibitors and attendees. They also say they are exploring their options for providing an online showcase for game industry announcements in June and promise E3 2021 will be "a reimagined event." Unsurprisingly, they confirm the cancellation is due to concerns about the COVID-19 coronavirus:

NEWS: E3 2020 CANCELLED DUE TO GROWING CONCERNS OVER COVID-19 VIRUS
After careful consultation with our member companies regarding the health and safety of everyone in our industry – our fans, our employees, our exhibitors, and our longtime E3 partners – we have made the difficult decision to cancel E3 2020, scheduled for June 9-11 in Los Angeles.

Following increased and overwhelming concerns about the COVID-19 virus, we felt this was the best way to proceed during such an unprecedented global situation. We are very disappointed that we are unable to hold this event for our fans and supporters. But we know it’s the right decision based on the information we have today.

Our team will be reaching out directly to exhibitors and attendees with information about providing full refunds.

We are also exploring options with our members to coordinate an online experience to showcase industry announcements and news in June 2020. Updates will be shared on E3Expo.com.

We thank everyone who shared their views on reimagining E3 this year. We look forward to bringing you E3 2021 as a reimagined event that brings fans, media, and the industry together in a showcase that celebrates the global video game industry.