It looks like the cat is out of the bag on these. Images from the following chapters are all here..... Imperial Fists, Black Templar, Iron Hands, and the Salamanders...... Wow.
Now you can see these all in one place.
A huge thanks to our friends over on La Voz de Horus for linking us up,
These apparently originally come from Bolter and Chainsword via Belisarius Cawl here