First off, the Concordance is not exactly an unlicensed book. Bjo got the copyright to the Concordance back when Ballantine published it, which is why, when the update was published in '94, it was able to carry the words "Star Trek" in the title, as opposed one of James Van Hise's completely unauthorized and unlicensed books, that can only have "Trek (fill in the blank)". "Trek" is not a registered trademark of CBS/Paramount, whereas "Star Trek" is. Bjo's copyright allows her to use the full title.
And if she wants to keep that copyright, she needs to stick to the terms of that copyright, which only covers what I listed above, TOS, TAS, and subsequent appearances of those characters. So, only those movies and episodes from the spinoff shows can be touched.
As for why now, the Concordance has been a fan favorite, in its various incarnations, for forty years, because it comes from a
fan's perspective, and is not just a historical recitation like the Encyclopedia. And frankly, the last version was a pretty big disappointment to Bjo and many of us who were involved in supplying material (the fan art is another big draw, which was largely eliminated by the clowns at Citadel). So, there's more than a small element of redemption here. If there's to be a last edition of the Concordance, we'd rather it
not be the Citadel version.
And don't worry about my biases. As I said above, I'm not writing it. I'm only doing the layouts. I'm certainly capable of being a good soldier and doing what I'm told with regard to the material. Besides, in the end, we're only talking one movie in a book that covers over a hundred episodes of the various series and eight other movies. I'll certainly be willing to give Bjo my opinions of the film, since the polarizing nature of the thing certainly deserves some comment, but I'm not going to force my views into the book if she doesn't want them there; it's her book, not mine.
I refer you to my major edit of "The Doctor and the Enterprise". I wound up doing a lot of tightening up of verb tenses, inventing a few sentences here and there (in the original, for example, Kirk never identifies himself to the strange man emerging from the Police Box, so I stuck in a quick, "I'm Captain James T. Kirk. You're on the Starship Enterprise.") But for the most part, I kept as much of Jean Airey's original text as I could, especially in the planetside scenes (those passages just needed some well placed paragraph breaks for the most part).
Go and compare. My version is accessible by the "junk drawer" link in my signature, the original is here:
http://www.scirev.net/who/archives/TheDoctorAndTheEnterprise.php