Yes, I think in terms of selling-tickets this is comparable to Hamilton. I was "forced" to buy tickets a year and a half in advance of the day I'll be seeing it, because I wanted to see it "soon"... soon now being 9 months after it opened. When tickets went on sale, initially only for something like 4 or 5 months, they sold out so quickly they added another couple months of tickets just a few hours later - at which point I decided I had to get in if I wanted to see it within the first year of its run. I have tickets for the weekend after my 30th birthday now, so it'll be a nice present to myself.
Tickets are currently only on sale though May, and are entirely sold out for Part 1, I think there are a few spare tickets here and there for Part 2.
I definitely think it will angle for one of the bigger houses, and they will also take appearance into consideration. I've seen photos of what they have done with the facade of the Palace in London, and I image they would want to do something similar once it comes to Broadway - i.e. I doubt they'll go into a house like the Broadway that is, sorry to say, kinda ugly on the outside.
And while there is no official confirmation of a transfer yet, it is definitely coming. J.K.Rowling always said this will eventually play all over the world, and that fans won't have to worry too much about having to track to London across half the globe (I'm from Germany, so London is easier for me than Broadway).
Keep in mind they haven't officially opened yet, I wouldn't expect any official announcement before the reviews are out.