From the article:
A new D&D adventure comes out on April 7th, pitting players against the forces of elemental evil in "Princes of the Apocalypse." Gale Force Nine gave us an exclusive look at the process of creating the miniatures being released to accompany the adventure, from concept art to completed mini.
Gale Force Nine will be releasing one elemental cult a month from April to June. The plastic minis come unpainted and do require some assembly. GF9 Creative Manager Matt Parkes walked us through the entire process