on 13 December 2014
I have the 2nd edition (hardcover), which I bought long ago. I was considering buying this edition as well but it seems that the *only* difference is a new subsection (2.4). I've checked both books section by section and counted the number of pages in each section and can confirm this.
In conclusion, if you want to save some (possibly a lot) of money, consider the second edition instead.