The "appointment" is an alteration of an almost century-long interpretation that, according to previous JW theology, Jesus had assigned the "faithful and discreet slave" class to essentially rule over Christ's "belongings" or servants and other earthly interests beginning in 1919. Beginning in that year, it was taught, that Jesus' assigned the "anointed remnant" (which previously was synonymous with the "faithful and discreet slave") the control over the following:
1. THE PREACHING OF THE RESTORED GOSPEL: With Christendom being found lacking, Jesus assigned the anointed who associated with the Bible Students prior to 1914 to be the official mouthpiece instead of the churches. This was in exchange for their faithfully preaching about 1914 some 40 years prior and left in confusion (or placed under trial by Jehovah) for the 3 and a half times that were prophesied to follow in Daniel and Revelation.
2. THE WORK OF GATHERING THE LAST OF THE ANOINTED: Being that they had not been transferred to heaven in 1914 as previously taught, the job of in gathering all into the "Little Flock" was "obviously" not complete. Thus it was taken away from Christendom and given to this faithful group to complete the number of 144,000.
3. GATHERING OF THE EARTHLY CLASS: The official interpretation is that the remnant was all but complete except for a few spots, and the thousands of others who were responding were a new group of people who would inherit eternal life in a paradise earth. These people were baptized as members of the Kingdom, and thus became part of Christ's "belongings" that the anointed were assigned to care for.
This previous teaching was that the anointed remnant as a group were the physical representation of the heavenly government of God's Kingdom, each exercising that royal rule in their own way since 1919.
When the current time frame proved the above impossible, the current Governing Body dismissed all of the above. When the Governing Body declared themselves and only themselves to be the composite "faithful and discreet slave," they also had to change the previous teaching. They now claim that no such assignment as outlined above was ever given to the anointed remnant as a whole. The time for members of the anointed as a whole to exercise rule is now after the Great a Tribulation has come, and not before...except for members of the Governing Body, of course.
As the reality of the "faithful and discreet slave" mentioned by Jesus, the Governing Body members are now the only ones who exercise any leadership over JW members. With this new interpretation, it has yet to be seen whether the Governing Body will now claim that only members of their group ever gets such "right to rule" in the future.