From the announcement:
From the magic-swept lands of the frozen north march the Warriors of Chaos, an indomitable race of battle-hungry killers and mutant monsters who fight for glory and the favour of bloodthirsty gods...
On Advance Order today are new Warriors of Chaos multi-part plastic kits and exceptionally detailed Citadel Finecast miniatures, as well as Warhammer Armies: Warriors of Chaos and a new Warhammer Battle Magic set.