I’ve got to be honest, I am not a Universal Parks fan, and YES we used to go to both IoA & US when we were Florida residents. It’s not that I am just pulling that opinion out of my hat 'cause I’m a Disney fan. I also know nothing about Happy Potter beyond the popular culture basics. I’ve never read one of the books & I’ve only seen one of the movies, the first one.
That being said, after looking at some of those conceptual drawings & reading some speculation on-line about it I think I would TOTALLY visit IoA again for a day to check it out. It looks unbelievably immersive & just really cool. I could see us going there for a day to check it out, but maybe like a year after it opens & the hubbub dies down a little.