With the new chaos Codex and Fantasy they will be bringing back Malal, one of the original chaos gods.
For Games Day they are releasing his mighty champion (whose name I have forgotten) he was a comic character waaaay back when citadel journal first started out.
There are two models apparently.
One holding a big axe and another with his fist plunged into a wood elf's chest, pulling out his heart.
I kinda like this last one.