The latest in a long line of Windows titles of this name covers Windows 8.
Windows 8 in Depth is by no means a Windows 8 certification book, but it is a good general all-around reference on the latest Windows desktop OS. Author Brian Knittel has worked on every edition of this book so far, all the way back to the days of Windows NT and Windows 2000. Paul McFredries is a recent addition to this book, but has written numerous titles (Amazon has him listed for over 200 in all, with 95 involving one version of Windows or another) in the general area. Between them, the two authors have over 40 years of combined Windows experience, and it shows in the breadth and depth of coverage you'll find in this book.
A quick look at the detailed table of contents for the book -- available in PDF form as part of its sample pages download -- shows useful coverage on installation, UI operation, networking, and one-off tuning and tweaking topics. There's also some useful coverage of multimedia, security, and mobile/shared content in the Windows 8 environment as well.
Readers seeking more information about small-scale installation and use of Windows 8 will find this book well-suited to meet their needs. From a Windows 8 certification perspective, however, what's missing includes the range of automated image capture and deployment tools that IT professionals routinely use for larger-scale roll-outs, as well as system management tools and facilities they'd use to update and maintain end-user installations out in the field. But when the upcoming crop of 70-687 and 70-688 books finally come to fruition, I suspect those lacks will be remedied completely, because those topics are bound to figure somewhat into 70-687 ("Configuring Windows 8") and quite heavily into 70-688 ("Managing and Maintaining Windows 8").
Until that time, Windows 8 in Depth is a great place to start reading and learning more about Microsoft's latest desktop operating system.