No official word yet what it covers, or whats in there, BUT would imagine its themed on the ill fated drop zone landings of the Iron Hands, Raven Guard, Salamanders, at Istvaan V, and there brothers turned enemies.
Hopefully we're see a new primarch release in the next week or two.
Courtesy of Faeit
http://www.youtube.com/watch?v=OERW6DuG5Qg
The video looks amazing, and I wish that we could get the same treatment with codex releases (after all there is new artwork I am sure they could show off..... add music and text).
Everytime I see one of these books, I feel the need to get one. Just check out the book cover above, and the artwork below.