Hold a Story for new High School pack?

I think it depends on how planned your story is. The downside right now is that you've never played the high school pack, and don't know how it's all going to work, which makes it possible for stuff to happen that doesn't mesh with your story. I'd want to try it out a few times first and make sure I had a handle on how to make things go certain ways before I tried to set a story in a high school if I was particular about it.

But if you're less planned out and ok with giving up some control it might work out. Or if waiting includes not just waiting for the pack to come out but also holding off until you've played through the new pack in another save.