Author Chris McCubbin sent us another note about the Confederation Handbook.
It would never occur to the publisher to mention this in marketing materials, but it might be important to long-term fans, especially with the movie still a few weeks away. It should be known that the Confed Handbook is about 95% spoiler free. It doesn't reveal any of the major plot twists of the movie, just sets up the situation and characters as of the movie's start.
So if anyone out there was worried about spoilers, the Confederation Handbook is clean.