Expect hot and humid with occasional t-storms during that time period. Since you won't be at any significant elevation, these are some thing that I would consider leaving at home: rain pants, rain jacket, insulation, beanie, gloves. You won't need much of a sleeping bag either as night time temps probably won't be much below 55-60F if even that cool. I slept in a clean tee and shorts and some nights barely had my bag draped over me.
I'd probably pack my houdini for combo light rain/bug protection, and take along some deet, a headnet, and some sunscreen. I used aquamira drops through that section without any issues.
Yes, there are plenty of rocks. Some stretches you'll be more rock-hopping than hiking but overall I thought it wasn't as bad as was described. If you're feet are unconditioned though, you might expect some soreness.
And as with most Mid-Atlantic/NE hiking, check yourself for ticks nightly.