It is hot, very hot. The crowds are manageable, and the lines are not bad.
Drink LOTS of water. Even if you don't feel thirsty, drink. Make sure all youngsters in your party drink too. Take a break in the afternoon. We nap. That way we have energy to go out in the evenings, when it is cooler. I like our mister fan. The relief only last a few seconds, but it is better then nothing.
I don't know about this year though, with the free dining. We usually do the last week in Aug cuz it is Value season and my DS is still off of school. The free dining is going to coincide with part of our trip this year.