RE your question: "Does the Governing Body/Writing Dept. send out letters to the "anointed" all over the world, when 'new light' is going to be released, before they put it down in the WT?"
I used to think that same kind of thing. By dad was a believer in all the big Bethel legends about divine direction, etc. It is all a fairy story.
The entire teaching about two classes was a Rutherford fabrication. It is all theory, no practice at all, a total fiction. And it always has been. The suits up there at HQ don't have any idea who the "anointed" are, except the ones they know personally, and perhaps they could guess in the case of JWs who were active prior to 1935. But most of the "born before 1925" set are more concerned with whether or not their Depends need to be changed, than they are with any "new light".
One of the still-major figures up there (I won't say who to protect his tail) believes that the entire 144,000 number (which he still takes literally) was filled in the first century (most credible Christian historians think there were at least a million Christians by the end of the first century, when the Revelation was written), so this guy thinks that there haven't been anything but "earthly class" since then.
One of the big surprises for me at Bethel was to find out that the vast majority of the material in the publications, including study articles in the Watchtower, study books and any other thing that could possibly be construed by JWs as "New Light" is written, published and enforced by "other sheep". The only notable exception besides Ray Franz was Freddie Franz, and you could always detect his stuff a mile away because its style is what one would expect from an author who was given to fantasy fiction.
The other big surprise for we was that hardly any of the people who write the publications believe what is written in them in the way they expect the average WT reader to do. They are nearly all "apostates" in that sense. But they are all willing to publicly toe the party line to avoid the kind of unpleasantness that honesty begets in a place like that.
In the mid-70, when I was at Bethel, my friend Dan Sydlik told me that the other sheep of John 10 were the Gentiles. That made so much sense to me, and it fit so well with the actual state of affairs, that I rejected the two-class fiction then and there, even when I thought that the WTS was still God's organization.