Forge World has started taking orders for Primarch Vulkan over in their webshop.
From the website:
Vulkan, Primarch of the Salamanders, is a complete multi-part resin kit that includes a removable scenic base. Model designed by Simon Egan. The rules for Vulkan can be found in The Horus Heresy Book Two – Massacre and The Horus Heresy Legiones Astartes: Isstvan Campaign Legions books.
This model is available to pre-order now and will ship from August 28th.