"*These units are exclusive to the Chaos Warriors Race Pack and will not appear in the base game if you do not have the DLC.."
So maybe it's too early in the morning but I swear in the video below they say that even if you don't buy the chaos DLC / preorder the game, then all the chaos units will still be in the base game to fight against. Then why does the updated wiki state that this isn't the case.
Sorry CA if I have read/understood this wrong.
But if I haven't then shame on you CA. Shame.