Fwiw, I dropped a line to Rich Hamilton on this; I sort of vaguely recall seeing this question asked (or answered) on another board awhile ago -but I don't have the link readily available.
I think the situation involved that the lead scenario designer for NRC moved on from working with JTS some time back, and that the update is basically is Rich's responsibility. I don't know what all is going to be involved in the update and would defer to Bill's statement on that as he is much more familiar with the state of the NB series than I will be.
Anyway, it will be updated, I am sure of that, as it would have to be at the very least just in order to remove the disk in drive check that would make allowing for a digital download possible (or in other words that is how it worked in the past with titles like 1776 and other older titles that JTS wanted to make available to HPS to sell through their download facilities).
Now as to why this didn't get addressed earlier, basically speaking that people associated with the company really probably only spend very little time on messageboards in any given day -as I understand the situation, Rich has relied on people pointing him to reports of questions on boards for awhile (I know this because I have done this a bit- but I don't actually make the rounds like I used to as I got additional responsibilities that basically prevent that from occurring.).