One key change to the revised translation is the removal of the beginning of John chapter 8. Remember the good old "Whomever is free of sin, let him cast the first stone?" That part is conveniently gone from the revised version.
Also Mark Chapter 16, where Jesus adds to the commandment of preaching the good news by saying "This signs would accompany those who believe, you will expel demons, cure sickness, etc" and much more.
Those are very inconvenient paragraphs for the JW core doctrine. Forgiveness in the face of proven sin and the performing of miracles as proof of your backing by Jesus.
Is also notable that even smaller words have profound effects in the change of rhetoric. We could all see the video where brother Lett speaks of our responsibility to "uphold" the oneness of the spirit rather than "observe" the oneness of spirit. He says it himself, the new revised edition shows us we have to do more than merely observe. He claims we have a responsibility to share in keeping unity. (unity over biblical truth, that is)