The next book coming for The Horus Heresy threatens to set off the Giant Robot Alert a whole bunch as it's the Liber Michanicum, full of all sorts of automated additions to your forces. Get a look inside in this preview.
From the article:
Whether you’re a true devotee of the Omnissiah or just need some powerful robotic allies for your Space Marine Legions, we’ve got some exciting news for you today. We recently revealed a road map for upcoming Warhammer: The Horus Heresy rules, and fans of mechanised mayhem will have spotted that the first non-Astartes release is none other than the Liber Mechanicum: Forces of the Omnissiah Army Book.
This book is similar to the Liber Astartes and Liber Hereticus, but laser-focused on the massive range of units available to the Mechanicum – the Priesthood of Mars that’s responsible for producing the massive shipments of weapons, tanks, and other war materiel needed to keep the Great Crusade running. Naturually, they’ve kept some of the best bits for themselves – you’ll want to stay on their good side…