Hi, the vast majority of the book still applies to the current version of Stencyl.
I think the main Changes relate to fonts (which is minor) and backgrounds / foregrounds, which are now treated as layers, which is more intuitive.
If anyone wants to point out any other differences, please feel free to comment.
The vast majority of the book relates to logic and other issues which are not version-dependent. The book is still selling very well, and I'm not aware of anyone providing feedback about the book not being applicable to the current version of Stencyl.
There is a newer Stencyl book available, by a different author, but the styles and goals of each book are very different. It's probably worth going on Amazon.com and reading the reviews before making your mind up. Obviously, I am biased towards my book!