Maybe it's only for legal reasons. An option i'm thinking of a long time is that it's a cliffhanger for the jw.org website. Many witness mention at the WT study the jw.org website news section in their answers.
I think it's a new kind of situation: normaly all the witness are officialy informed by the watchtower study magazine about new light. That's gone. Most of the witness in 3th world country's have no internet access. They only have the magazine. So, the much called "Unity in JW education" is gone now!
Divide et impera.
Gorby