I just got my preordered book from my FLGS on Saturday.
Awesome. More "make what you will of it" Tyrant Star teasers, threats by Ordos and some nice "super villians". You have serious diversity amongst the foes presented to avoid that "Oh we're fighting cultists, again" feeling.
I would call this book essential for any Dark Heresy GM. If you're running a game, get it.
Cheers,
Stouty