Here is one page of KQ8 notes they released to the community a while back;
If you want lots of stuff for KQ7, the Roberta Williams collection has hundreds of images of concept art, storyboards, etc for the game.
I've uploaded some of it already;
There are four additional things towards the top that Roberta gave to the fans for KQ7 in the past (these include a couple of map notes).
One of the more interesting bits; A semi-nude image of Rosella, with notes discussing how Rosella's breasts and body should appear in the game.