Most notable to Weston 9.0 is the introduction of a kiosk/full-screen shell . This Weston kiosk shell runs applications always full-screen via XDG-Shell. This is intended for embedded use-cases and other scenarios where always running one application/surface at a time. This implementation can also help developers in creating their own kiosk-like shells in serving as example code.
Besides the new kiosk shell, Weston 9.0 also has improved testing infrastructure, support for the DRM panel orientation property, and other small fixes/improvements.
More details on Weston 9.0 via Wayland-devel .