The March 2015 WT is restating what it put in the July 2013 WT.
The F&DS were chosen in 1919, but in accord with the Mt 24 account they will not be rewarded until later. There are two different 'appointings', one past and one future:
(Matthew 24:45-47) “Who really is the faithful and discreet slave whom his master appointed over his domestics, to give them their food at the proper time? 46 Happy is that slave if his master on coming finds him doing so! 47 Truly I say to you, he will appoint him over all his belongings."
What I find interesting are the multiple identities given to the 'slave' in this illustration:
Verse 45 “Who really is the faithful and discreet slave whom his master appointed over his domestics, to give them their food at the proper time?" This is the 8 man (currently) Governing Body.
Verse 46 - 47 "Happy is that slave if his master on coming finds him doing so! Truly I say to you, he will appoint him over all his belongings." This is all of the 144,000 anointed.
Verse 48 “But if ever that evil slave says in his heart, ‘My master is delaying,. . .' ". This is a fictional slave that does not and will not exist.