I believe a stop will be added to Tufts Campus in Medford/Somerville. It won't change my commuting since I still drive but it'll be interesting to see how it turns out.
I'm not holding my breath. The general sentiment in my area is Green Line Extension 2000-never.
Seriously! How long ago was the Big Dig? They've been finding reasons not to do it for years now. I really do hope it happens however, since it would totally rock my world ;D