Just bought the book, and about 100 pages in.
HOLY FRIKKIN WOW is it awesome! Abnett has outdone himself. The writing is visceral, and you can just feel the despair, shock, and uncertainty oozing from the pages.
No spilers please, as I am nowhere near done with the book.

What has me a little confused is the cover: is that an ultramarine, fighting a word bearer in the open void space without his helmet on? and what the hell is in his hand????