We took the boat from Downtown Disney yesterday past the treehouses. some were pretty far along, all the way to new roofs and windows. Others looked exactly the same, as if they had not started on them. The Treehouses nearest the road are torn down and it looks like they have poured new concrete piers. So there are various stages of completion.
The old guard shack is gone and They were working on some type of rectangular ( pretty large) building to the left of the entrance, ground level with a regular peaked roof... no idea what that is. You can see all of this from vacation club way.