From the announcement:
To earn the ire of a Daemon is to sign your own death warrant. Gruesome warriors and fiends all, each of the entities that make up their ranks is a fragment of its patron god given form. They are as immortal as time itself and as powerful as the roiling emotions they embody...
Ready to pre-order today are ghoulish treats for all collectors of both Warhammer 40,000 and Warhammer miniatures. Chaos Daemons, also known as Daemons of Chaos in the Warhammer world, receive a host of mind-bogglingly brilliant new miniatures in plastic and Citadel Finecast, as well as a new Codex and Army Book, both of which come in a limited edition format.