From Josh on June 2nd regarding changes in June's operating hours:
Disney made a round of updates to the June operating schedule today. They have still not confirmed nighttime entertainment or showtimes for Rivers of Jungle Book for June, though the Park is staying open until 11pm nightly. At Magic Kingdom, a second Electrical Parade has been added on the majority of days. Interestingly, on some of the busier days of the month, they extended the close to 12am but didn’t add a second Electrical Parade, which is kind of interesting. Unlike last year, when we saw 13 regular 8am opens, there are currently no regular 8am opens this year. The Park also closes at 11pm every night except for four. Last year it never closed earlier than 12am and was open until 1am on seven nights. At Hollywood Studios, it looks like the Star Wars fireworks will be scheduled on just 13 nights over the course of the month. You may remember that they were nightly from January 1 – April 30 before moving to four nights each week in May. Those that want to see the fireworks may need to switch their schedule around though the show is typically scheduled on days that were expected to be busier. Obviously most days with the later close and fireworks will be busier than days with an earlier close without fireworks.
Feel free to go to the site and read the unhappy comments about the lack of hours and changing the schedule in June for June.
This will make the crowded parks even more crowded.