Found an older statement from Zwift worth reading:
The details aren’t yet worked out, but a rough plan is in place. The event will occur sometime near the 2020 Road World Championships, which begin in Aigle, Switzerland, on September 20th. Riders will gain entry through regional and national qualifiers, which will be scheduled in gaps between WorldTour races, allowing road racing’s top riders to enter.
Zwift expects riders from multiple disciplines, including track and mountain bike racing, to show interest, as races are likely to be closer to 45 minutes than the six and a half hours of road worlds.
Parity is a major focus. Men and women will run the same schedules, the same distances, with equal prize money.
“We’re looking at different formats, both individual and team competitions,” said Craig Edmondson, Zwift’s CEO of Esports. “We’ll be looking at different age categories. U23, and also masters categories.
My caution:
Keep in mind that the above statements were made BEFORE the C-19 Pandemic and that everything is subject to postponement or cancellation.