What do we know / have been told will be included.
Legion traits for 16 Legions (Not Vlka Fenryka or Thousand Sons).
Blood Angels, Dark Angels and White Scars will have Legion Traits. They will not have Primarchs in this book but will have the traits which will enable you to build a Legion.
Rites of War (including new ones) for all 16 Legions in this book. This includes a full Gal Vorbak force Rite of War and a full Kacophoni force Rite of War. This will be great to see, and hopefully we will get a taste of Heresy Emperor's Children coming through (lots of bright colours, piercings and handcuffs).
There will be a few new units for the Legions coming through, mainly stuff we have seen recently.
It will provide abilities to build shattered Legion forces. These have been very difficult to balance as could have easily have been a force where you painted a unit up in the scheme of the most effective Legion trait for that given unit (I.e. You may have a Breacher squad and decided to paint as Iron Hands as it would give you a better perk than if you painted it as Raven Guard etc).
Rumours are that the Black Shield force will be either expanded upon or buildable.
Argel Tal will NOT be in this book.
There is a new Titan Legio in this book which has not been seen before.
No information about the battles this book focuses around, but the whole Meduson series of conflicts are what to kind of expect.
That's it. With the base Plastic range incoming I am unsure as to when we will see this book. It could be that GW want to tie it in to their new range which should be coming out end of October. Or they could release it as per Conquest around November after teasing it at a Seminar at the 40k Open Day.
I believe we will see Corax on the 17th of October for sale.
The next which is either Dorn or Alpharius will be shown at a seminar on the same day. It will be done by Israel Gonzalez. As Israel sculpted both Sigismund and Dynatt (and did a fantastic job on Eidolon), these can both be seen as training pieces really. I believe he will be doing both characters at this stage, with Egan starting work on Leman Russ, Freki and Geri. We may see Alpharius or Dorn before Xmas. The other at the HH Weekender 2016 (where book 7 will be shown off) with maybe a teaser of Russ. At the moment I can not be sure who would do Magnus but I would love to see Trish set to it as I believe she is more than capable.
Anyhoo, come back for our Throne of Skulls Horus Heresy report on the 3rd and 4th October and the 40k Open day on the 17th where we will be reporting what we see up ASAP.