I would expect it should show up here when it's available to the public:
http://volpemit.com
This might be the presentation:
http://www.cambridgema.gov/CDD/Projects/Zoning/~/media/4101C40A72C0432DB88D194183A59C8E.ashx
City of Cambridge site...
That's where I was told it would hang as a bridge between the European and American wings. It's now installed, perhaps for a temporary exhibit, in gallery 246...
Re: Offical City Hall Plaza Proposals
It's strange how little info is available for this project but there is some additional news here: http://news.wgbh.org/2016/12/08/local-news/boston-winter
Re: Back Bay Garage Tower (Dartmouth and Stuart)
Stuart Street plannning study:
http://www.bostonredevelopmentauthority.org/planning/planning-initiatives/stuart-street-study