Well, seems that the “home base” was getting a bit jealous of Forge World getting all the Primarchs to themselves. Games Workshop has started taking orders for several new miniatures, including Roboute Guilliman (or “Bobby” to his friends) who is part of a “Triumvirate of the Primarch” set. Or you can go with a big Deathwatch set. There’s also the new book, The Gathering Storm: Rise of the Primarch. All of them are available to order now.
From the website:
A strange fate binds Roboute Guilliman, Grand Master Voldus and the Fallen Angel Cypher together. They walk a path of providence; though whether it ends in damnation or deliverance, none can say. On the battlefield, this triumvirate of warriors is an unstoppable, inspiring force, bolstering the morale of those they lead while shattering enemy lines with their staggering strength. Cypher’s pistols roar as Voldus’ psychic powers lash out – all the while, Guilliman strides like a reborn god, bellowing rallying cries and striking down countless foes.