We've seen it before and now the rules are fully out from Forgeworld on how to use it. Its a Lord of War for Chaos Space Marines, Khorne Daemonkin, and Chaos Daemons. It's loaded with a Kytan Gatling Cannon and a Great Cleaver of Khorne, so you already know its D weapon. Check it out as the latest information coming out of Forgeworld Open Day.
Image thanks to Lady Atia.