From the dev -
PlagueOS aims at minimal architecture and killing off classes of exploitation that are inherent to modern desktop environments.
The aim of the OS is to function as a restricted, minimalist hypervisor (host) that runs virtual machines (guests). The guests on top will vary based on the desired utility. For daily use, it is advised to run Whonix (tor routed) or Kicksecure (clearnet). Normal tasks are meant to be conducted inside of the guests rather than the host to ensure the host stays clean with minimal attack surf
Interesting looking project; apparently an option to install sway as the window manager.