I'm as in the dark as you can get concerning Harry Potter 2.0, but since it was announced I've considered the Hogwarts Express to be the feather in the new expansion's cap; even more so than Gringotts. Due to not only the visibility of it as the only means of transportation between London and Hogsmeade, but also due to the sheer novelty of a ride that picks you up inside the gates of one theme park, only to drop you off inside the gates of another.
That being said, I'm sure UC has a helluva ride in store for park guests. I mean, isn't a Dementor attack rumored (ala Prisoner of Azkaban)?
Like I said, I'm in the dark, but based on what it is I believe more attention is being paid to Hogwarts Express than any other part of the expansion.
I could also be completely wrong. :thumbs:
Cheers!
-Andy