Time for a very early review - Epic Universe is great. Easily UOR's best park. Thematically it's great and filled with kinetic energy. The scale at Potter is mind-boggling. HTTYD & SNW will be a hit with kids and Comcast investors. DU is great with what it has, but will need to be the first major expansion for Epic out of necessity.
Let me be clear, not every attraction is a major hit or industry-changing experience, but the variety/collection here surprised me. It still needs a major "passive" experience ala Haunted Mansion/Pirates of the Caribbean, but Epic Universe at least provides something for every sort of park guest.
The queues throughout Epic are arguably the best.
Monsters Unchained... will set a standard for how to blend practical & virtual effects. I really hope this attraction will be maintained to the highest standard.
The park was designed with lots of dining capacity, so I have to imagine APs will come available sooner than later to allow them to operate restaurants late into the evening after the initial summer rush.
The walk (for me personally) isn't too bad but some folks might find it difficult. However, it's a straight shot with no major elevation changes... which the CityWalk walk does have. If they add shaded areas and benches between the parking lot and the park, I think it'll be fine. But they will need to provide some form of shuttle service for folks who need it.