Finally got my 2013 atlas today - found it at my local gas station and after numerous trips to Walmart with no atlases whatsoever, I jumped on the full price version. Here are some changes vs the 2012 for New England:
The Brookfield Bypass (US 7 north of Danbury) is shown as completed.
A new city insert for Lowell replaces the one for Fall River.
Much more detail shown in the Boston detail city insert. Rail lines are shown, and North & South Stations are labelled.
Boston & Vicinity map has been extended west to show I-495, additional toll barriers on the Mass Pike shown, 128 shields removed from the portion of 128 that is no longer signed as such (between I-95 Exit 12 and I-93 Exit 7, Tobin Bridge finally shown in green to denote a toll road.
For some reason, the "info center" icons are gone from the I-91 welcome center NB before Exit 1 in Brattleboro and on I-89 between Exits 1 & 2. Both areas are open, but the icons are gone. RMcN seems to have a problem with keeping rest area status up to date (many along the Northway in NY are closed but are still shown on this atlas).
A rest area icon has been added in Gardiner in between the Maine Turnpike and the north end of I-295. In reality, this should be a service area icon (then again, so should the ones on I-95 and CT 15 in CT, so should the ones on the JFK Highway in Maryland, the two on the Mass Pike between Exits 2 & 3, etc.. etc....).
No update to rest areas along the Adirondack Northway. Several are now closed, but are still shown on this map.
Tolls continue to be shown on the Niagara Section of the Thruway in Buffalo. These were closed and removed years ago.
"World Trade Center site" has been replaced with "National Sept 11 Memorial" on the Manhattan detail city insert
Those are the highlights I see in areas I know. Overall, not too bad.