Everest will remain open as long as the park is open, and I'm sure they'll continue to play Tough to be a Bug, but likely not too many of the live shows (due to labor costs). Dinosarland can open at night as well.
A few years ago, my wife and I were able to visit DAK during one of the last EMH's. It was incredible. I have no desire to visit the park during the day, which is one of the reasons we haven't been to DAK during our past several trips. But once it begins opening at night, it will absolutely be in our plans again.
Much like the other 3 parks, it's a completely different place at night. The lighting is low, which creates an awesome atmosphere. During that EMH, we walked around the entire park. Most of the park was empty, especially around Africa, and it was quite peaceful.
I'm looking forward to the opening of Pandora and the rest of the nighttime offerings.