Again they look monopose and snap fit, this time Nurgle flavored, but apart from guts on the loose one they will be spot on for any chaos god after appropriate paintjob. All are mutants though so their cultist use is reserved for Openly heretical or Undercity cults. Most of them will work in fantasy too.
My favorite is coated one with tentacle. I just need to find him suitable head.
In the other news.. Truescale Marines fodder is upon us in the same starter, they will help my conversion work very much.
And last but not least Plaguemarines themselves.. I have to admit they (in similar way to DV Chaos marines) are cherry on the cake - best models in the set - I might break and have do some Nurgle after all.. :(