The War Zone Nachmund: Vigilus Alone book is coming soon for 40k. Inside, it's full of all kinds of background information about what's going on in the universe. However, it's not just fluff, as it's also got updates for the Adeptus Sororitas. Have a look at some of the update in this preview.
From the article:
The first Season of Warhammer 40,000 begins soon, with the Nachmund Gauntlet ablaze once more. The catalyst for this pandemonium comes in the form of War Zone Nachmund: Vigilus Alone – a book packed full of background information and rules for Warhammer 40,000 games set in the Nachmund sector.
Alongside War of Faith rules which see you attempting to win favour with your gods, new war zones, and an Army of Renown, the Adepta Sororitas are getting a high-power shot in the arm with a codex supplement for the Order of the Bloody Rose.