October 2019 Watchtower p. 16 (the key scripture for researching this is Rev 16:21 for other similar comments)(quite a few weasel words, likely, may, may, we have to wait and see, seems
During the great tribulation, the message that we proclaim will likely change. Currently, we are preaching the good news of the Kingdom and we are endeavoring to make disciples. But at that time, we may well deliver a message as hard-hitting as hailstones. (Rev. 16:21) We may proclaim the impending doom of Satan’s world. In time, we will find out exactly what our message will be and how we will deliver it. Will we use the same methods we have used for over a hundred years to accomplish our ministry? Or will we use some other methods? We will have to wait and see. In any case, it seems that we will have the privilege of boldly proclaiming Jehovah’s judgment message!
Here's another good one from W15 7/15 p. 16: This will not be the time to preach the “good news of the Kingdom.” That time will have passed. The time for “the end” will have come! (Matt. 24:14) No doubt God’s people will proclaim a hard-hitting judgment message. This may well involve a declaration announcing that Satan’s wicked world is about to come to its complete end. The Bible likens this message to hailstones when it says: “Great hailstones, each about the weight of a talent, fell from heaven on the people, and the people blasphemed God because of the plague of hail, for the plague was unusually great.”—Rev. 16:21.