The WT Org doesn't appear to be abandoning the appointment of ALL the 144K over the Master's belongings, even though the scripture does designate that it is the faithful slave who is appointed over them.
The annual report says this: "Jesus will reward “the faithful and discreet slave” by resurrecting the individual members of that group to heavenly life and by giving them royal authority over all Christ’s belongings in heaven and on earth. This is the same reward promised to all faithful anointed Christians."
They might be taking a page from current marketing strategies of releasing a product to the public and then making updates, upgrades, and corrections per feedback from customers. There still doesn't seem to be a study article about the changes outlined at their annual meeting, which might give them the perogative of pleading temporary insanity and reverting back to their former teaching.