Also i doubt they will just bring Jigsaw, it would probably be a best of SAW house with a teaser to the movie at the end, due to the fact that the movie comes out on October 27th, nearing the end of the event.
On the home page it still says there are 9 houses, so they wont remove one, plus that would be bad buisness; people are only expecting them to get bigger not smaller. The 6 boxes could simply just be the prizes for the "soul collectors" like the wallpaper they gave us today.