This may not be a new to many of graphic programmers. The author changed its publisher and had to change the name of series, so the new name is not ShaderX8 but GPU Pro.
I also found the author is preparing GPU Pro 2, so I guess now we need to remember this new name.
I spent about an hour skimming the book here and there. One thing I noticed is that now many of articles are based on Shader Model 4 and 5.