I just completed my April 2020 Disney World Crowd Calendar that includes the Extra Magic Hours schedule, Magic Kingdom parade and Fireworks, Fantasmic, and Rivers of Light schedules. Here’s the details.
Star Wars Fireworks for Hollywood Studios aren’t listed that far in advance. It doesn’t mean they won’t offer them, but they aren’t there yet.
Park hours should extend for some dates, especially Easter Week, but we will likely have to wait until much later to see them. We will likely see longer hours at Magic Kingdom and Animal Kingdom and perhaps Hollywood Studios. It’s very unlikely to see Epcot change hours.
These are merely initial park hours and things change A LOT over the next 6 months. Hope it helps you plan out your days at least! Here’s the link to my free Disney World Crowd Calendars!