Khurasan Miniatures have added several packs of 15mm figures and vehicle in their new Mekanoid War Robots series of miniatures.
From their website:
Invaders from beyond the rim of the galaxy, the Mekanoids are intelligent, sentient robots which have been gouging a trench across the Milky Way, building some sort of network of planets through which a mighty channel of data flows, to what end it is presently unknown. When one of the great Mekanoid Sphere-ships materializes in orbit around a planet, it is doomed, for all life (“bio-contaminants”) will be systematically destroyed, and the once thriving world will be shaped into nothing more than a node in the Mekanoid Network.
Against organized “bio-contaminant” resistance, the Mekanoids will teleport their mainline war units into the battle: the bipedal Grenadier infantrybot and the centaur-like Dragoon cannonbot. Hovering overhead, supporting these with heavy and mobile firepower, are the dreaded Hatchet gunships, sentient machines that pour firepower into targets from above.