How are they going to structure this? Castlevania felt easier since there was so little story baked-in. But Miyazaki specifically made Dark Souls games hard to parse because he was trying to recreate the effect of reading english fantasy novels when he wasn't fully fluent in english.
The story in Fromsoft games are specifically sparse, spread out and require interpretation to grasp more than the bare surface. Most of the NPCs that give you meaningful dialogue are somewhat hidden. If they play is straight like a normal show, it might not feel like Dark Souls. If they make it obtuse, it'll be hard for viewers to parse in a 6-12 hour series compared to the dozens of hours players get to think on it.