This is all great news, and I second this part specifically.
Are you by any chance planning to set up a "community-made products" store on DriveThruRPG, like the one for Call of Cthulhu?
Will the Red Cow campaign also be sold on DriveThruRPG at some point in the future?
That's where I bought all my Heroquest titles, and I would rather keep everything in the same digital library, if it's possible.
One thing I noticed when reading this chapter was that Mostali don't have (or at least don't use) any kind of engine. They use animal power to make their larger machines run - even the Capstan of Curustus is powered by dinosaurs.
I, on the other hand, would rather have a text that describes and explains the image that's actually there, rather than the one that exists in the author's mind. I find that really jarring.
But it seems that I'm in the minority about that.
I remember there was a licensed Uz book for Heroquest by another company (now out of print and basically forgotten). I don't remember the name of the book or the company ("Unspoken Words" maybe?) though.