I heard the letter read. There was no mention of the great tribulation. The letter references the recent hurricanes and tsunamis, and the need for congregation elders to have contact info on all publishers and emergency plan in place.
Basically the book study overseer will get home phone, cell phone, other phone, address, and contact info of nearest relative living outside the congregation's territory. This information will be compiled by PO, and all elders will receive a list...I think the CO will compile a list from all congregations. This already happens for the most part...most congregation secretaries use a software program to keep the publisher's time and contact info. The new part of this process is to gather info on the nearest relative living outside the territory.
Last year in the U.S. after Hurricane Katrina hundreds of JWs left the New Orleans area and the WTS had a hard time locating them. The WTS doesn't want this to happen again, they want to hold onto as many publishers as possible. After all they're losing enough publihsers as it is.
Again, there was no mention of great tribulation or anything like that. The WTS and local elders simply want to be able to keep track of it's human resources.