Veteran Scribus developer Andreas Vox has started the ScribusCTL project. CTL stands for complex text layout and attempts, among others, to integrate the OpenType text shaping engine HarfBuzz. ScribusCTL will be synchronized with Scribus 1.5.1svn, and every finished project stage will be integrated into the official Scribus 1.5.1svn branch.
It’s an ambitious project project, so every available help is welcome. More information on the ScribusCTL wiki: https://github.com/andreas-vox/ScribusCTL/wiki