Heres a little food for thought...
So i just received my preorder boxes in the mail (yes!) and while unpacking them my OCD kicked in... here are all of the card subtypes of the starter box...
Cross-Faction: Soldier, Vehicle, Elite, Tank, Scout, Psyker, Ally, Scholar, Transport, Drone, Warrior
Space Marines: Ultramarine (8), Blood Angel (2), Dark Angel (1), Iron Hands (1), Raven Guard (1)
Chaos: Tzeentch (6), Demon (6), Khorn (3), Cultist (3), War Engine (1), Nurgle (1), Slaanesh (1), Alpha legion (1), Black Legion (1), Death Guard (1), World Eaters (1), Priest (1)
AM: Catachan (2), Abhuman (2), Conscript (2), Cadia (1), Elysia (1), Vostroya (1), Mordian (1), Officer (1), Tech Priest (1)
Eldar: Alaitoc (3), Biel-Tan (3), Saim-Hann (2), Spirit (2), Iyanden (1), Altansar (1), Harlequin (1),
Dark Eldar: Wych (5), Kabalite (2), Succubus (1), Beastmaster (1), Haemonculus (1), Raider (1), Creature (1)
Tau: Pilot (3), Shas'la (3), Shas'o (1), Hero (1), Vespid (1), Kroot (1)
Orks: Boyz (6), Nob (4), Oddboy (2), Warboss (1), Walker (1), Runt (1)
Keeping in mind that this list is only including units and events that shared a common subtype with units, and that some cards have more than one designation... Immediately after finishing this list i wish i had done it in spreadsheet fashion so i could allocate how many of each cross-faction subtype were used in each faction... but that is what a future work day is for!
My immediate reaction is that, knowing the first 4 rounds of spoilers, all of the future commanders are adding new subtypes or building up ones that are fairly trivial in the starter (space wolves, nurgle, etherial, oddboy), and the pictured spoilers seem to by a balance between adding subtypes (white scars, Tallaran, Uthwe, Iron Guard) and bulking out the existing ones...
It makes me wonder how far down the road this has been thought out, as there are an awful lot of faction based subtypes with only one card and im not quite sure why they would be differentiated unless there was a plan to use that designation in the future. For instance the Orks have none of the traditional factions (Speed Freaks, Bad Moons, Etc) Even though Nazdreg's quote specifically mentions that hes a Bad Moon, but jsut about every major AM planet has a card...