I seem to recall them being a little "testy" when OKW was being built oh so many years ago, about people wandering around the construction site(DH and I were there on our honeymoon and were being nosey!). My guess is that it's a liability issue rather than a "keep it secret" issue. It is a construction site, with a high possibility for injury.
My guess is that Disney has already taken the noise factor into consideratin, and will plan the arrnagement of the buildings accordingly. From the artist's renderins I've seen, it looks like it's going to be beautiful.
I'm thinking along the lines of a pool with areas of spas bubbling up sort of "melded" into the pool area, so it's not a "pool is here, hot tub is over there" kind of thing like some pof the resorts are. More along the lines of SAB, which has the little waterfall and the little cove-like areas, and the hot tub is kind of part of the landscaping in a way.