There's a Game in this Book v1.5

From the introduction:

Why 1.5 instead of 2.0?

Because... well, because. We felt that the game
is still very much in its “first” edition. Some stats
have changed, sure,and we’ve added a bunch of
new content, but the system is still recognizable
to all of our fans.

A truly new, second edition, would imply a set of
vast and drastic changes that completely alterthe
core rules of the book. This is not that edition.
If you have characters created in 1.0, you willbe
able to convert them to 1.5 (we have notes on
page 173 on how to do just that).