It appears that the Horus Heresy books will extend out past 10 books like we had originally been told. Now we are looking at 15-20 and most likely some supplements of some kind to keep it going. The Horus Heresy is extremely popular.
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via a reader here on Faeit 212
The news from the Horus Heresy Weekender is that Forgeworld Horus Heresy books will extend beyond the original planned 10 to 15 or even 20 (they're too not sure yet). If we think: next is Angelus (number VIII), then the return to Calth (IX), Schism of Mars (at least one more), the Siege of Terra (at least two books), we are already at 12. Maybe even one for the following Age of Retribution (just my conjencture in how to fill 20 books). It means the way is still a long one to see the end, or more bangs for the bucks, if you prefer.