A friend of mine told me that forgeworld intends to publish four books for the warriors of chaos/daemons, one for each god.
they practically create a WHF expansion.
I understand that the expansion takes place after storm of chaos, Karl Franz is dead and every god will come from a cardinal point, Nurgle comes from the east, north Khorne, Tzeentch south and Slaanesh from the west.
the first book is Nurgle and since it is from the east will also have units of chaos dwarves as allies.
the first and second pics are concepts of the book, the third is the cover of the book.
the guy in the middle is tamurkhan/tamurkin, he is the chosen of Nurgle and has the power to take the form of anything kills (he is instead a colony of worms or something like that)