From his interview on CNBC today, Disney CEO Bob Chapek talked about a number of things, including that he expects guests will be required to wear masks in the park at reopening, even during summer months.

"...along with social distancing, one of the things that we're likely going to require is masks for both the casts and the guests..."
(At the 5 minute mark of the interview if you want to skip ahead to that portion)

Also talks about other things including the ramping up steps at Shanghai Disney.

https://www.cnbc.com/video/2020/05/1...ob-chapek.html