Yes. Disney posts their base hours and then updates them as the dates get closer based on demand. This has been their practice for years, if not decades. Demand is very high the week of April 4, as indicated by the non-availability of theme park reservations.
Any story you read about shorter park hours is inaccurate. They look shorter because those 8 or 9 hour days are their base right now. Extensions come about weekly. Expect the week of April 4 to be extended this Friday.