WingCommander:
It's the "Study Bible" they've been tolling away on now for several years. Completed and shipped, and these are the first runs. The JW Broadcasting for November is that Monday, so it all coincides. I'm sure Geoffrey Jackson or Mark Sanderson (whichever one collects the old bibles) will get the honour of announcing it to the world.
Unlikely. The 'Study' NWT has been progressively worked on for some time, and the study notes on the online version, which have only been done for the New Testament, go as far as Philemon. Since the content is online already, it wouldn't be 'confidential', and since they haven't finished the study notes for the New Testament, the boxes wouldn't be ready to go out this month.
6 November is the first day of the week that will consider the study articles in the September issue of The Watch Tower, which might give more of a clue if it's something to do with their 'message'. Otherwise, it might be an updated 'Organised' book. (Probably not the 'Shepherd' book, which they're more paranoid about being leaked.)
The 'announcement' about the 'confidential boxes' is only for 'Service Overseers', so the general 'rank and file' won't officially know the boxes exist until November.
(I do suspect they are working on an updated commentary on 'Revelation', though I doubt this is the contents of the 'confidential boxes'.)