No, yrs2long, they actually gave no reason for the change. They just presented a pile of "updated understandings". But everyone with a brain more capable than an average JW's understands that the reason for it was the failure ot the notion, 1914 + 80 years = 1994. As 1994 approached without incident, and in fact, with the demise of the "King of the North", it was painfully obvious that something needed to change. People on the Net were laughing at the Society over this. So at the summer assemblies in 1993, they presented a preliminary to this updated understanding of "the generation" and confused the hell out of the few JWs intelligent enough to actually think about it. A lot of us knew that this was only the first of a series of changes, since what remained of the various end-times doctrines was painfully inconsistent, and we made many predictions on the Net that there would be bigger changes coming. So in 1995 the Society finally changed the basic notion of what "the generation of 1914" was supposed to mean to JWs.
The new understanding boils down to this ridiculous notion: the generation of 1914 is whatever "generation" is living when "the end" comes. Of course, thinking people realize that this definition has nothing whatsoever to do with 1914. If "the end" comes in the year 3000, what connection is there between "the end" and 1914? Obviously, none. But the Society has no other choice, except to abandon 1914 altogether. But that would kill off a huge number of JWs who have been hingeing their lives on the 1914 date.
So today, the Society is retaining the date, but gradually moving away from attaching any real events to it. Today, the 607 - 1914 calculation is still on the books, but is not talked about much. The newer generation of JWs is not getting brainwashed into the unthinking state about 1914 that the older generations have been. Eventually, the Society will abandon the date, but by then it will have become a relic of history anyway, and the abandonment will be a mere footnote, much as was the jettisoning of 1874 in the 1940s.
AlanF