We were there during that time period last year. They do cut back a bit from the easter break hours. Epcot is almost always open until 9:00pm, and I believe last year they did not open until 10:00am. I believe MGM opened at 9:00 and was open until 7:30 to 8:30 most nights . AK opens at around 8:00 and closes around 6:00. MK varied quite a bit. It opened at 9:00 and stayed open later on the weekends (9:00 or 10:00 pm). During the week, I believe it closed at either 7:00 or 8:00 depending on the day.
The official schedule for this year will probably not come out until late February, however, we have been there for the last 4 years at around the same time and the schedule has not changed much from year to year. Hope this helps.