Source
From the announcement:
CoolMiniOrNot have partnered up with Kvasir Innovations & The Army Painter to develop and produce custom paint sets for the popular Zombicide board games by Guillotine Games. This exciting collaboration will at first spawn two paint sets: The Zombie Core Paint Set and a Toxic/Prison supplement paint set.
The two amazing paint sets are scheduled to be released at GenCon, August 2014.