Hollywood Studios is the first park to hit capacity in the first opening week as the park reservations start to fill up.
Even though we are not yet allowed to fly to Florida (and who knows when as COVID-19 cases in Florida are rising), Hollywood Studios is now full until July 19th, with a few Animal Kingdom and Epcot dates full, too. Although it's unclear to us at this stage what the daily capacity is set to, we can see demand starting to fill the parks up.
Disney Resort and other select hotel Guests with valid park admission can see availability starting June 22, 2020, Annual Passholders without a Resort hotel reservation can see availability starting June 26, 2020, Theme park ticketholders without a Resort hotel reservation can see availability starting June 28, 2020.