I will say that the Squats/Dwarfs/Kin exist in this quest, but their lore is probably going to end up being a hodgepodge of various headcanons overall. I personally do like the soul clone/caste society of the current lore, along with the general high tech theming. But I also probably will make them very much the quality side to the Imperium's quantity. Think heavily mechanized across the board with Knights being their frontline fighters.
Their lore is not yet really settled beyond the basic aspects: 1) they are molded from pre set DAoT Soul Templates, 2) they have working AI to a degree, 3) their armies are near entirely mechanized forces with no infantry, 4) they are very long lived and artisanal about everything