There will be a lot of initial restrictions though, such as requirement for pre-booked entry slots for guests with existing bookings and for annual passholders, and a temporary block on any new bookings or ticket sales. The My Disney Experience app/website is not accepting any new reservations for FastPasses, ADRs, or imminent hotel bookings. There will also be many social distancing policies introduced, including no close-crowd generating activities such as fireworks, parades and character greetings. Face coverings will be required for cast members and all guests over 3 years old.
There is less detail on the hotels, but it looks as though they will be reopening in phases. starting with Fort Wilderness on 22 June.

For more information, see the Disney Parks Blog update.