Per our PO, real "cloak and dagger" stuff...
He received a "highly confidential" letter from the Society last week, instructing him to
1) Read the letter
2) Tell no one else about it until 4/27...specifically told NOT to announce to the congregation "there will be a big announcement next week"
3) Re-seal the letter in a new envelope, not to be opened until 4/27
4) Read the letter to the congregation after the WT study on 4/27...he is allowed to inform the elders of the contents of the letter just prior to the start of the public talk, if he wants to.
He did not tell me what the content of the letter was, but he was pretty freaked out about it.
Other threads on this board have indicated the change is a shortening of the Book Study and melding it onto the same night as the Ministry School and Service Meeting (which would be shortened as well). That sounds plausible, it would be enough to shake up our very-old-school PO.