If I recall correctly, when Hogshead Publishing had the WFRP license, they were planning on releasing a supplement in which the PCs were all Chaos Warriors and they were invading a Skaven Lair.
I would love to see a product like this for WFRP3, maybe after Omens of War and the Slannesh one. I think it would be a great diversion to have a party of characters, each being a champion of a different Chaos God, using 3E rules and components.
FFG, by my decree, make it so!
RS