Knowledge Unlatched focuses on open access (OA) in humanities and social sciences, with over 100 monographs made OA and a community of around 300 libraries from 21 countries. The initiative aims to expand into backlist titles and journals, with plans to collect content from publishers starting June 2016 and a pilot program for journals targeting 350 libraries. Participation involves cost-sharing, with significant returns to publishers and targeted pricing for libraries.