The Black Legion supplement is due to hit in 7 short days. How is that for quick. I know several sites are saying Sept 7th, but the official release information is listed below with a link.
Expected Release: 17 August 2013
Publisher: Games Workshop
Print Length: 157 Pages
Requirements: This book can only be viewed using iBooks 3.0 or later on an iPad. iOS 5.1 or later is required.