The negotiation wasn't that long. Less than six months (whereas we've had others stretch on for two years!).
For me, Black Company was one of those rare instances where I was sucked in by a cover. It was 1984 and the original novel had just come out. I saw the illo of Soulcatcher with that wicked dagger and thought, "Wow, that looks cool." So I read the back cover and the book sounded interesting, so I picked it up. 20 years later and I'm going to publish the RPG book.
As for GenCon, it's way to early to tell what we might have there. A preview is definitely possible.