So that title may seem a little confusing to you
"Horus Heresy is a completely different game and campaign system? How can a single faction be made like a game?" You may be asking.
How many of you are tired of Cadians and Catachans? Especially since Cadia has now gone the way of Alderaan? Remember when there was more to the guard?
Well there easily can be again.
Essentially do the following
3-4 core infantry squads in plastic. Something like:
Then maybe a resin squad or two of the same faction for veteran, heavy weapons or command elements.
-Praetorians (mordian base)
-DKK (steel legion base)
-Elysians (cadian base)
-Valhallans (steel legion base)
-Tallarn (catachan base)
-Tanith (catachan base)
-Savlar (cadian base)
-Armageddon Ork Hunters (catachan base)
-Vostroyan (steel legion base)
-Attillans (steel legion base)
And they could go on and on with upgrades and transfers. And finally add variety back into humanity. This could also very easily accompany a campaign IA book with some unique rules for various guard forces, allowing a few specialized FW characters or kits to be made. Maybe expand on an iconic conflict, like the Macharian Crusade, which thematically would be right up FW's alley. They are really really good at that whole "Future History" sort of thing.
I just think it would be really great to see more variety in the IG again, and to me this is the most efficient, economical path to do so and has a proven record of success in the form of the HH product line.