I think it's just the older films got more attention as far as being remastered and cleaned up, something most of the Brosnans didn't really need, and that's one of the selling points.
I would hope they would do more as far as extras go for films like GE, TND and TWINE, which suffered since they came out before DVD got huge and didn't include proper making of documentaries and such.
I don't think that had much to do with it. Adter all
The World Is Not Enough came out on DVD in 2000 and by that time it was pretty much accepted by everyone in the business that DVD was going to overtake VHS as the format of choice.
After all it was in 1999 when the Baskerville Study (always thought that was a funny name) was released that stated that DVD households would outnumber VHS households by 2010 (boy, was that ever a conservative statement). My point is that 1999 really was the turning point for DVD and after that it was accepted by all the smart money that VHS was as good as dead.
But, the real reason that the first three Brosnan's did not get those retrospective documentaries was because retrospective documentaries need time.
The World Is Not Enough's DVD came out at the same time as the second wave of DVDs after all, so its not as if they didn't know how to make them.
With Craig being a bit controversial with the public bond fans, it could be difficult on him and his appeal to be showing the Brosnan era Bond on TV at the time CR comes out. You know media people, they love controversy! I bet they have a Bond build up to the movie premiere...one week on AMC, the next on Spike, then on TNT...etc etc...Then Craig will have to compete with not only the image but the history as well.
Well given that AMC is part owned by MGM (and therefore by Sony) I don't think it will be a problem.
I am still salivating at the knowledge that the Roger Moore hosted 25th Anniversary Special is going to be included. That was great news, I remember watching it on television back in 1987.