We will be working with GNOME/GTK, KDE/Plasma and Ubuntu Touch communities, and have partnered with the foundations behind them for the middleware layer. PureOS currently is GNOME-based and look forward to working with GNOME as an upstream as well as GNOME’s OS and design-centric development model; however we will also test, support, and develop with KDE and the KDE community, and of course we will support Qt for application development.
Learn more about the rationale behind this approach (part 1 and part 2).