The thing with Universal is, they build "E-ticket" style rides all over each of their parks. Disney only has 1 or 2 per park that people rush to at rope drop. At US, you have Gringotts, Rockit and Transformers. At IoA you have FJ, Spiderman, Hulk and Kong. Even then, you still have a lot more thrilling rides. This is why Universal has rightfully earned the "theme park of adults" image. Nearly every ride is a thrill ride with very few "kid friendly" rides that cover nearly every single Disney park.
I don't think Kong will change things to much in the long term. First few months maybe it will but HP will forever be the big draw at Universal and IoA.
With a nearly 6 minute long ride time and 5 massive trucks, it's going to be an interesting thing to see how the line works. Will the line have "show rooms" that tell you back story to help break it up like Gringotts or will it be done FJ style where you have to let people move ahead of you if you want to stop and watch the "pre-shows"? Will the station have a set unload area and then the truck drives up the loading area empty or will it happen in the same area? How long is the intended loading time. Trying to get 72 people loaded at once will take some time I think.
As far as park hours go, it is going to be interesting. I feel like they will keep IoA open longer this summer once they both open but during slow season, i'm not sure. I still feel like bringing back to the two park concept for HHN would be an ideal thing to do this year but I am 99% sure that won't happen.