Hey! I'm new here. I work at IOA and I've been apart of the commissioning team for Project 722 and I'll also be on the opening team for one of the attractions (they haven't told us which yet, we find out in Feb). I believe Hatetofly already said this but I can confirm Dan Rad IS going to be in the attraction. I hate the "name" though, I think it should be changed to "Harry Potter and The Gringotts Escape", sounds more grammatically pleasing.
While I haven't personally been INSIDE of the ride, I have been behind the london facade and inside Hogwarts Express and I just wanna say...omg. I'm just as excited for the train as to the actual ride.