There is a reservation system that is how they know how many people are allowed in the parks each day. Even if you have tickets, you can't get in without a reservation.
Disney has not divulged what will be open and what will be closed. All guests must have a park pass reservation in addition to valid therme park admission in order to enter the park. There are limited park reservations available and must be made in advance of your visit. Same day reservations are not available at this time, and new ticket sales have been suspended until further notice.
Yes, they will only let half of the usual maximum capacity in but i dont know about what will be closed
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