So exactly where do I start.... Since
@WDW1974 has asked for no spoilers and I hate the finger sniffing chimps that post spoilers... so I shall comply despite of how it would kill my writing style for a review.... We'll draw the line at "We know it takes place in the Wizarding world and in London, UK." Beyond that, I shall leave this spoiler free.
Lets start at the very very beginning. This expansion brings to fruition the premise that Walt Disney started in 1955: Making the guest part of the story. You walk around a corner and without any warning, you are instantly into the story. Sights, sounds, smells, all of it immerses you and washes over you - you truly are a muggle lost in a wizard's world. The level of detail is incomprehensible - you start peeling back layers only to find another layer and before too long, you wonder where this rabbit hole stops.
Every detail from the books is there. Avid readers of the books will find easter eggs. (Might want to avoid my photo take on the wire today as well). The entire land is a story; moreover the guest is the story and it could take weeks to explore everything. There are twists and turns through the alleyways - paraphrasing Frank Miller here, Walk down the right back alley and you can find almost anything.
The art and imagery of the area is exactly what I expected.... if my expectations were turned up to 11. Depending on where you are, the art is either a subtle suggestion or full on, visual assault that makes it look like a box of crayons melted together only to find a masterpiece at the end.
I ran all over this land today, in a vain attempt to make it in every shop, restaurant, show and attraction - still didnt see it all and NO, i did not ride the marquee attraction. While the streets mimic a narrow London, the most of the shops are a bit bigger. Yet everything is still cozy. Crowds will be an issue. Parkhopping should not.
The 2 1/2 hours I was allowed to roam after the press conferences ended - Universal kept most of the press bottled up and under "supervision" until 12-1230 or so - was nowhere near enough time to look, see or explore everything. I explored the queue of one attraction, finding it greater than my expectations while I rode the other attraction which vastly exceeded my expectations.
A few things didnt meet my expectations: a voice actor here and there that didnt sound right, team members that didnt know the material of what they were working and team members that didnt seem to understand that working a media preview means you're going to get photographed.
In closing? Its not the Intellectual Property that they use, its HOW they're using it. Universal is making you the story.
If Disney plans on building Star Wars, the gold standard of immersing your audience in a story was just set very high.
(In full disclosure as part of my coverage of the event as well as everyone elses, they fed us lunch. That's all I accepted.)