I don't think there's really much new in this letter, apart from the obvious realization that some dodo has had that it might just be easier to have one letter with all the information in one place rather than spreading it all about in NINETEEN letters from the last TWENTY-FIVE YEARS.
After all, the WT's house of cards is falling down, so why have a house of letters instead when just one will do
1. This letter has been added to the list of policy letters that will be cited in Index to Letters for Bodies of Elders (S-22) and replaces the letters dated January 1, 1991; November 2, 1995; April 15, 1997; May 30, 2000; July 30, 2002; August 1, 2003; December 31, 2005; January 8, 2008; December 11, 2009; December 20, 2009; June 11, 2011; April 8, 2014; June 9, 2014; March 30, 2015; October 14, 2015; October 15, 2015; October 26, 2015; May 13, 2016; and September 23, 2016; to all bodies of elders.