The Warhammer 40k
universe has quite an expansive history. Much of it focuses around the pivotal moment of the Horus Heresy. The Emperor's greatest creation, Horus, turns against him, having listened to the call of the gods of Chaos. A massive civil war ensues, the ripples of still being readily felt some 10 thousand years later. For those that want to head back to those days for your games, you're in luck. While originally delayed, the Horus Heresy rulebook will be available this year. And considering how much time is left in "this year," that means it's damn-near here.
From the announcement:
Good news, Horus Heresy fans.Source
You loyal Legionaries and faithless Traitors have been ever so patient, and very soon that patience will be rewarded.
After a brief delay, we’re very happy to announce that The Horus Heresy: Age of Darkness Rulebook is back on track, and you won’t have to wait long to get your hands on it. In fact, you’ll be able to order your copy this year (that’s right, within the next 11 days)!