As of now (8:30 AM 9/7/2017) Disney World is open. All theme parks, water parks, resorts and transportation system are operating normally. Disney is monitoring Irma's path and has begun regular updates to Cast Members.

The first impacts of the storm will arrive in the WDW area on Sunday. It is too early to predict what actions Disney will take. Based on past experience, and further based on the current forecast storm path, we can expect that Disney will close all theme parks, water parks and Disney Springs. Resort hotels will likely remain occupied, except for Fort Wilderness which will be evacuated.

To be clear, this is not yet Disney's decision. It is my personal opinion based on previous WDW operations during hurricanes. I live in the area and have access to Disney's Cast Member information releases. I will try to provide updates as they occur.