CM Valrak left an interesting tidbit about the new detachment/formations in the upcoming Vigilus campaign book here: http://www.bolterand...ries/?p=5198611
To quote Valrak (sorry mods, having trouble with the quote codes):
Do we know if the Detachments in the book are linked to specific subfactions (Chapters/Regiments, etc) or if there are generic/open ones? I assume there are.
Valrak: Something I left out my video (sorry long day), you basically upgrade your detachment so get new traits for your Warlord, new stratagems etc. I'm actually in bed at the moment, super tired, lads, I will get more stuff out tomorrow sometime.
Black Tempalrs and Ravenwing were mentioned in this first book at getting new stuff (Rules wise)."