One thing you may notice is that the first story in the book is in the main trailer for the game. Very interesting...I wonder whether this is part of the plot in the game or just a hook to show what a Witcher life can be like. Can't wait for the game to be released!
The whole intro to the game is based on that story. It's the first Sapkowski ever wrote about Geralt.
The game's plot is happening 5 years after the books (the whole series which comprises of 2 volumes of short stories and 5 part saga) so this story probably won't be a part of it. But we've seen some screens of sthriga in the game, so who knows :)