I want to preface this by acknowledging that the RPG and previous iterations of Kislev aren't in any way reliable indicators of what we're going to get. That's pretty obvious by now.
Still, I couldn't help note that the campaign mechanics seem fairly focused on the organized religion and political matters of Kislev, and there sorta being this very specific absence of the more folkloric, backwoods-esque thing that Kislev had going for it. Concepts from the RPG, like the Ancient Widow (the almost god-like personification of Kislev itself), Witch Hags, etc.
Now, it might very simply be that these things have been written out with "NuKislev", and in its place we have the Orthodoxy and Court of Ice. It might be that the more morally ambiguous, dangerous spirits of the land are now channeled by the Ice Witches, which seems supported by them having access to the giant spirit bear and the cats, among other things.
However, I'd like to think that there is room there for a themed DLC in the future, with creepy cunning folk, Ungol foresters, creatures of myth and so on. A darker edge to the Kislevites, one that is present in the background, emanating from below, from peasants' stories and standing in opposition to the more organized, hierarchical traits of the Ice Queen and Kostaltyn. Not hostile, just... demanding its due. And refusing to die.
I dunno, it would have been fun.