I believe this is the first time the WTS has abandoned the idea that there will be some of the remnant left on earth to lead the Great Crowd into the New World, much like Joshua led the Israelites into the Promised Land. This new timeline requires all of the anointed to be in heaven before Armageddon begins. Some on the board have already described this as the rapture.
I wonder if the WTS will abandon its tortured logic regarding the verses in 1 Thessalonians 4 that contrast those having been asleep in death with those who survive to Christ's presence and will be changed in the "twinkling of an eye." If memory serves, the interpretation was that contextually, Paul was talking about death and so a person's being changed would have to be preceded by his/her death.
The web becomes more and more tangled.