The people of Earth now know that the human Colonial Union has kept them ignorant of the dangerous universe around them. For generations the CU had defended humanity against hostile aliens, deliberately keeping Earth an ignorant backwater and a source of military recruits. Now the CU’s secrets are known to all. Other alien races have come on the scene and formed a new alliance—an alliance against the Colonial Union. And they’ve invited the people of Earth to join them. For a shaken and betrayed Earth, the choice isn't obvious or easy.
Against such possibilities, managing the survival of the Colonial Union won’t be easy, either. It will take diplomatic finesse, political cunning…and a brilliant “B Team,” centered on the resourceful Lieutenant Harry Wilson, that can be deployed to deal with the unpredictable and unexpected things the universe throws at you when you’re struggling to preserve the unity of the human race.
I am specifically looking forward to the collected edition because this has been coming out as a serial since January; I could have been collecting the thirteen segments on my e-reader for a buck or two apiece, but chose to wait for the hardcover. I've had a Nook for over a year now, but I have not been using it nearly as much as I could have, mostly because I'm cheap like that and prefer to get my leisure reading from the library.
Anyway, I quite enjoyed all of the Old Man's War series to date, so Scalzi's return to that universe makes me happy.