Yes, during the tribulation ahead, the preaching message will be simple. "The Kingdom of the heavens has drawn near."🙂 We won't need a fancy committee or governing body or church headquarters to explain what the message should be. It's already in the book!
As you go, preach saying: "The Kingdom of the heavens has drawn near."
The message hasn't changed. There is no special "hailstone message" that is going to be conveyed or something by some GB/FDS. The message is the same. "The Kingdom of the heavens has drawn near." That will be the message until Jesus comes on the clouds and everybody sees him. Then we won't have to share that message anymore, because everybody will see that he'll be here and it will be obvious.☺️
"First of all, then, I urge that supplications, prayers, intercessions, and thanksgiving be made concerning all sorts of men, concerning kings and all those who are in high positions, so that we may go on leading a calm and quiet life with complete godly devotion and seriousness. This is fine and acceptable in the sight of our Savior, God, whose will is that all sorts of people should be saved and come to an accurate knowledge of truth. For there is one God, and one mediator between God and men, a man, Christ Jesus, who gave himself a corresponding ransom for all—this is what is to be witnessed to in its own due time. For the purpose of this witness I was appointed a preacher and an apostle—I am telling the truth, I am not lying—a teacher of nations in the matter of faith and truth."
(As regards the hail of Revelation, the hail plague is on religion, it's describing part of the attack of the UN on religious institutions.
"And I will make justice the measuring line
And righteousness the leveling tool.
The hail will sweep away the refuge of lies,
And the waters will flood out the hiding place.
Your covenant with Death will be dissolved,
And your agreement with the Grave will not stand.
When the raging flash flood passes through,
You will be crushed by it.
As often as it passes through,
It will sweep you away;
For it will pass through morning after morning,
During the day and during the night.
Only terror will make them understand what was heard." (Isaiah 28:17-19))