When the body of elders has determined who will be the new presiding overseer, who will serve as field overseer, Bible study overseer, etc., announcement can then be made to the congregation.
... However, if the body of elders has in mind using a brother who is newly being recommended to the governing body for appointment as an elder, they should wait until such appointment is received before making any definite assignment. (The congregation will not receive a letter from the Society appointing brothers to serve in various positions of oversight. Rather, the present presiding overseer, using the S-10 form, will inform the Society which brothers will be serving on the committee. The Society will send a letter covering only new appointments of elders and ministerial servants and also deletions.)