Green line extension

[phortlane.livejournal.com]

I keep hearing that the Green Line will be extended in Somerville in the next few years, but I haven't heard anything more specific.

Can you point me to something official that says when this will happen? Is there a date planned for the Union Square station ground-breaking? How about the rest of the route?

And is there anything that could get in the way (e.g., not enough funding from the state)? Thank you.