Are you talking about the Leap Day special event, or in general? There really are no WDW restaurants open 24 hours. Some of the resorts may have access to their CS to purchase grab and go items but they close the grill at a certain time, so no hot food.
If you mean the Leap Day special event, no specifics have been released or even mentioned, except that "Select attractions, entertainment and services will be available." Nobody knows which ones. I would guess at the very least some CS and snack kiosks, but I don't think the TS will be open 24 hours (the 24 hour opening applies only to Magic Kingdom)