Via Bad Transit comes the news that the current Government Center "headhouse" (i.e., the aboveground, brick part of the station that now looks like the place you'd go when the sirens go off) will be replaced with an airier glass and steel structure - and a brand-new entrance next to the JFK Building just for the Blue Line (underground, the T will rebuild the Green Line platforms to accomodate "low-floor" trolleys, while the Blue Line platforms will be lengthened to allow six-car trains).
Bad Transit adds plans call for bricking over the sunken "fountain" area, and discusses why this is a bad thing.
Details and renderings from the MBTA (hmm, why do they show a deserted Government Center with almost no people? Do they know something we don't?).