Josh at easyWDW has posted updates to Disney World’s operating schedule for October, December, and January. The December update is especially important since it includes a number of new Extra Magic Hour mornings around Christmas.
As a general note, I always check easyWDW for schedule updates before any trip. I know that I could pull the information directly from Disney but Josh’s layout and information is way more convenient. (I even prefer it to using MyDisney Experience to look for future park hours.)