wow. So hard to tell facts from rumors right now. As far as I understand, the building shutdown is known from an announcement supposedly made at brooklyn bethel breakfast table and reported by second-hand sources, as well as the searchers account from the Bethel service desk?
I believe construction crew right now in Britain are just 40 people in trailers moving dirt & planning (this is from the jw-tv video); it's really impossible to tell what's going on without inside sources as these 40 people can just be told to hang tight for the coming year (i imagine you want people on the site at all times to avoid stealing).
The construction is bound to be completed one day. It will be interesting to compare the finished construction/schedule with what has so far been released.