Watchtower 14 11/15
They stated this in the article that God will give them instructions during the GT, although they don't say how they can't already be included in the Bible because they would already know these instructions (or before the GT) as they specifically say they will be given them during the GT.
Sorry but I am having trouble with the quotations and this is an edit to say that the second quote is about the scrolls of Revelation being opened after Armageddon with instructions. It seems a bit of a contradiction that they say he will give them instructions during the GT but after the GT, they will be in scrolls.
When Gog begins the assault, Jehovah will tell his servants: “Go, my people, enter your inner rooms, and shut your doors behind you. Hide yourself for a brief moment until the wrath has passed by.” (Isa. 26:20) At that crucial time, Jehovah will give us lifesaving instructions, and the “inner rooms” might well be connected with our local congregations.
18 If, therefore, we wish to benefit from Jehovah’s protection during the great tribulation, we must recognize that Jehovah has a people on earth, organized into congregations. We must continue to take our stand with them and remain closely associated with our local congregation. With all our hearts, may we join the psalmist in proclaiming: “Salvation belongs to Jehovah. Your blessing is upon your people.”—Ps. 3:8.
Likewise, the Bible informs us thatscrolls will be opened to give us directions in new world living. (Read Revelation 20:12.) These scrolls will most likely set forth Jehovah’s requirements for mankind at that time. By studying these, all people, including resurrected ones, will be able to know God’s will for them. These scrolls will surely give us further insight into Jehovah’s mind. Guided by an ever-increasing understanding of God’s inspired Word along with what will be revealed in the new scrolls, inhabitants of the earthly Paradise will certainly treat their fellow man with love, respect, and dignity. (Isa. 26:9)
Then there is this very interesting article from the Watchtower 07 01/01 where they are telling us that they know someone is communicating with them but they don't know who.
Watchtower 07 1/1
11 What, then, can we deduce from the fact that one of the 24 elders identifies the great crowd to John? It seems that resurrected ones of the 24-elders group may be involved in the communicating of divine truths today. Why is that important? Because the correct identity of the great crowd was revealed to God’s anointed servants on earth in 1935. If one of the 24 elders was used to convey that important truth, he would have had to be resurrected to heaven by 1935 at the latest. That would indicate that the first resurrection began sometime between 1914 and 1935. Can we be more precise?
The Bearing Witness Book claims that they are the only organization being led by HS
This should not surprise us, for no other organization on earth is led by holy spirit in “bearing thorough witness” worldwide regarding Jehovah God, his Messianic King, and the established heavenly Kingdom!—Acts 28:23.