Many of them may or may not be done before Easter break, it all depend son when your Easter break is.
As for Dining Reservations only 60 days out, it is a blessing, really we don't have the dining plan here and you don't need reservations for most restaurants if you are flexible with when you want to eat. The exceptions are Carthay Circle, Blue Bayou and dining packages, otherwise, book when it is convenient on the 60 day mark.
Park hours are never posted more than a few months in advance due to the fact that the majority of the people who come are locals. This means that crowds are less predictable further out than a couple of months, so the hours may vary based on local events.
As a general rule though, during the most common Spring Breaks, they will be on peak season hours, which will see
Disneyland open 8 AM to Midnight with two shows of Fantasmic! per night and two Soundsational parades per day. DCA will be open 10 AM - 10 PM with one Pixar Play Parade per day and one World of Color show Monday-Thursday and two Friday-Sunday.
Rumor has it that by Mid March Freeze the night will end and will be replaced with the return Mad T (Diamond Edition), but to date there has been no official announcement made. We do know that most of the Frozen events are supposed to end Mid March.
But ultimately, Disneyland is getting ready for the 60th, so yes a lot is closed and will be closed between now and May 22nd. Keep in mind that every Fantasyland ride will be closed for about a month and a half between now and then to get what those of us that frequently go to Disneyland call "The Alice Treatment"
None of these are hard and fast rules, but really, the parks out here have policies that are designed to be more spontaneous due to the nature of who the parks cater to.