I'm really hyped for this book and I won't be spoiling myself for a change so this is the last time I visit this thread until I've read it. I was wondering what it meant by their encounter with the EC as they did not appear in Scars. However it seems like they feature in this post-Angel Exterminatus. Fun to see Eidolon again after his decapitation (despite it was a dick-move to bring him back) also some more new character and their interaction against the White Scars.
Also I see a connection with The Sigillite-audio drama even though that is some of his lesser good work.
Edit: Also if you want to post spoilers, just use the spoiler-tags here which will hide the text unless you click the button.