The current EMH schedule will still be in effect for your trip. Each day one park will open an hour earlier than the posted park opening. Only guests staying at WDW resorts can enter during this hour. The schedule is:
Beginning May 9th, WDW will begin testing a schedule that features additional hours either in the morning OR at night. You will miss this trial period.
Hey, if you're that disappointed, you could always push your trip back by a week.