The state has announced that they are going to press onward with this, as part of the Central Artery transit commitments that they haven't (yet) eliminated. The first phase of planning, the Major Investment Study/Alternatives Analysis, is done, and is online:
http://www.mbta.com/projects_underway/b ... nning.asp#
As to the terminal point, its not determined yet. See:
http://www.mbta.com/projects_underway/p ... er%206.pdf
As always, no projects are assumed built until actually completed. Actual results may vary wildly from what is committed to by politicians. Interested observers may experience signifigant personal aging before any construction actually takes place, if at all. [/quote]