Here are my expectations of the proposed hubs from the concept art
Central Hub - Lots of color and intricate details. Walkways and shops surrounding various pools and fountains. Lots to explore.
Nintendo Land - This is just a copy of Japan's. So not much surprise except for the unseen Donkey Kong expansion. But seeing it in person will be nice. I am sure nostalgia will hit when I hear the sounds pulled straight from the games.
Classic Monsters - This is probably my most anticipated area. The theming should be off the chart. A recreation of a small European village and castle. Stonework, a small rustic well in the center of the land, possibly a clock tower, cobblestones. And if Universal goes all out, sounds of crows along the roof tops, wolves howling in the distance, the ever present sound of wind blowing through the village, and shutters swinging open and closed. Fog machines at night for bonus points. And that doesn't even cover the rides.
Harry Potter - Mixed feelings about this land. But, Universal hasn't failed on a Harry Potter land yet so I will give them the benefit of the doubt. Just hope that it isn't 100% Fantastic Beasts.
HTTYD - Never watched the movies, so there's that. But from what I have seen in trailers and clips, the theming of this should be an easy win.
Overall - Everything will have that new park smell. So, even if I am not interested in the rides or Ip's, a brand new park is going to be Willy Wonka's Chocolate Factory for me no matter what. Wide eyed and mouth agape.