In 2007 the latest edition of the NW "T"was released as a paperback.
Some minor changes were made as mentioned by posters above. For instance the regular edition says of Col 1:16 "By means of him all [other] things were created" While the latest edition says: "By means of him all other things have been created" with the brackets removed. The same holds for 1:17 twice.
In this the Watchtower leadership has gone back to "old light" because the original 1950 edition of the NW "T" did not place brackets in these verses.