The park operating hours and Extra Magic Hours schedule for Walt Disney World has been significantly changed in a recent calendar update.
Most of the evening Extra Magic Hours at the Magic Kingdom have been moved to different days from mid-July until the end of the year, along with morning Extra Magic Hours at Disney’s Animal Kingdom. Both parks have seen significant extensions to park hour. The Magic Kingdom has seen an increase in the number of Main Street Electrical Parade performances.
Disney’s Hollywood Studios has also seen changes to EMH days, and a lot of extensions to regular operating hours and additional Fantasmic! shows.
Epcot appears to have escaped any changes so far.
If you are planning, or already have a trip planned, you should double check the calendar for any changes that may impact your trip.