Believe it or not, The Watchtower has begun referring to the Faithful & Discreet Slave scriptures as a "parable:"
The Watchtower (Simplified Study), March 15, 2015, Page 11:
6 What basic message do we learn from this parable? Remember the context of the Bible account. In Matthew chapter 24, Jesus discussed “the faithful and discreet slave.” That slave would be a small group of anointed men who would take the lead among Christ’s followers during the last days. Jesus warned those men that they must remain faithful. In the next chapter, Jesus uses the parable of the ten virgins to counsel all his anointed followers in the last days. The message was to “keep on the watch” so that they would not lose their heavenly reward. (Matthew 25:13) Let us now examine the parable and see how the anointed have applied the counsel.
Pages 17-18:
3. What do we learn from the parables in Matthew chapters 24 and 25?
3 When Jesus told the parable of the talents, he told three other parables that were also part of the sign of the time of the end. All these parables describe specific qualities that his followers must have. We can read these parables at Matthew 24:45 to 25:46. The first parable is about the faithful slave, the small group of anointed ones who have the responsibility to teach Jehovah’s people. They need to be faithful and discreet.* (See footnote.) The following parable is about the ten virgins. In it, Jesus warned all the anointed ones that they would need to be prepared and watchful because they would not know the day or the hour when he would come.* (See footnote.) Next, Jesus told the parable of the talents to teach all the anointed ones that they would need to work hard in caring for their Christian responsibilities. Then, Jesus told the parable of the sheep and the goats, which focuses on those who would have the hope of living on earth. He emphasized that they must be loyal and do all they can to help his anointed brothers.* (See footnote.) This article will explain the meaning of the parable of the talents.
Insight Book (2015), Volume 1, Page 805:
When answering the apostles’ question concerning his future presence and the conclusion of the existing system of things, Jesus Christ included a parable, or illustration, dealing with a “faithful and discreet slave.” The faithful slave’s master appointed him over his domestics, or household servants, to provide them their food. If approved at his master’s coming (evidently from some trip), the slave would be rewarded by being placed over all the master’s belongings.—Mt 24:3, 45-51.