There are rumors of a new Khorne Codex supplement and one for Nurgle as well. This one is a little salty but does come with a codex cover which can be traced back to the Deviant Art site by MikhailSavier. This makes the rumor even less likely, but take it for what it is.
Please remember that these are rumors. This just might be loaded up with salt. However, we are rumored to get specific God Codices later next year, Tzeentch is supposed to be first.
Here is a link to the original artwork by Mikhail Savier (which rocks btw). You can see the rumored cover on the 4chan link.
Also a big thanks to James who did the leg work on this one.
here is another link to the information over on Heresy Online with pics
via 4chan by Leakshop
Can Ally with Demons or CSM
New Missions (also for Apoc)
-Champions of Khorne (Berzerkers with +1 on A and Ld ) have “Butcher´s Nails” rule which gives 6++ & FNP)
22 Points each, can take Melee and Ranged Weapons and Juggernaut of Khorne for extra 30 Points each.
-Berzerkers are Troops and can take CSM-pods (like SM pods, except that they do damage instead of scattering when landing on top of enemy units)
-Lord of Skulls is in (Apoc only)
Models will be released in 3-4 Months along with the NurgelDex and Kits.
-Chaos Terminator Lord of Khorne (clam pack)
-CSM Pod (repacked Pod with Spikes)
-Berzekers/Champions of Khorne (dual Kit)
-Deathshroud/Plague Terminators (dual Kit)
-Plague Marines/The Infected (dual Kit)
No kit for the Juggernaut version of the Champions
No Info on Nurgle