From their website:
While the sins of innovation and initiative are frowned upon by the Adeptus Mechanicus, new patterns and designs of weapons and armoured vehicles are still created. The Macharius Omega is one such vehicle, created with a single focus, that of the battlefield deployment of the Omega Pattern Plasma Blastgun. The STC for this weapon was originally discovered by Explorator-Magus Hum’nal in late M39, but a Mechanicus schism over the purity and completeness of its template delayed the testing and eventual deployment of the Omega pattern weapon for centuries.
The Macharius Omega, designed by Stuart Williamson, is an extremely detailed full resin kit featuring some incredible interior detail. This open-topped super-heavy tank also includes two unique crew figures: a Cadian gunner and a calculus-servitor. This mighty war machine is available to pre-order now for release on the 6th January.