Excellent news today, the big Leviathan Dreadnought from Forgeworld is up for pre-orders. There are a couple options as well that are up including the close combat Siege Claw and Drill, or the Storm Cannon and Grav Flux Bombard.
New From Forgeworld
http://www.forgeworld.co.uk/en-US/New
Leviathan Dreadnought with Siege Claw and Siege Drill £46
Leviathan Dreadnought with Storm Cannon and Grav Flux Bombard £72
Leviathan Pattern Siege Dreadnought £72
Description
Created in limited numbers in the latter days of the Great Crusade, the Leviathan pattern Siege Dreadnought was developed in secret on Terra, away from the pervasive oculars of the Mechanicum. Its massive frame incorporates hybridized technologies, some dating back into the dim past of humanity. Towering over later Imperial walker patterns, this heavily armoured dreadnought is savagely powerful.
The Leviathan pattern Siege Dreadnought is a multi-part resin kit. It includes optional torso mounted heavy flamers and volkite calivers, an optional Phosphex discharger and an 80mm round base.