The new Drukhari codex is due to hit the Games Workshop webshop soon. If you're wanting to get your evil, dark crusade going in the far-off future, you'll want to get it. And if you want to know more about it before you buy it, you'll want to check out some more of the preview rules that GW's posted up.
From the article:
Whoever said crime doesn’t pay obviously never visited the Dark City,* where the nefarious crime lords rule with impunity. Now, thanks to the Crusade rules in the Drukhari codex, you can join them.
The new codex introduces a range of unique rules that can be used alongside those in the Warhammer 40,000 Core Book to represent your Drukhari Crusade force. As your army grows, you can take advantage of Agendas, Requisitions, Battle Scars, and more to really personalise your force.