The 2017 version of Boy Scout Requirements is now available. It contains 2 minor updates to the rank requirements (for Second Class and First Class), 1 new merit badge (Exploration), 4 merit badges with substantial revisions, and minor revisions to 32 other merit badges.
Some of the changes are just corrections of editorial errors from last year, or document changes that appeared in new merit badge pamphlets during 2016.
You can find the information here: http://usscouts.org/advance/changes/advchanges17.asp
All of the web pages for the ranks and merit badges with changes have been revised to show the current requirements, and have links to pages showing the details of what actually changed, and to pages showing the old requirements for those Scouts who have already started work.
Thanks to Paul S. Wolf of the U.S. Scouting Service Project, Inc. for this review.