I have been wanting to read this book since I heard Stirling was writing a non-fiction book on trends of the next fifty years, and saw it in Unity books the other day.
Really good stuff. He's pretty slim on concrete predictions but takes seven ideas or trends that are already beginning and extrapolates how they are likely to pan out over the coming decades. There's a lot of interesting stuff there, as well as a few funny asides. Well worth reading. I feel like I may need to go through it again to digest everything properly, but this won't be a chore.