In preparation for the upcoming 10.10 release, the Budgie team has rolled out version 10.9.4 of this desktop environment, a minor maintenance update focused on backend modernization rather than visible desktop changes.
Among the more notable things, this release introduces support for libpeas 2 and Girepository 2.0, updating Budgie’s plugin system to align with the current GNOME and GTK technology stacks.
In other words, from a user’s perspective, as I mentioned earlier, nothing in the interface or behavior of the desktop has changed; the update focuses entirely on developer-facing improvements.

For example, developers and packagers should note that Budgie’s ABI versions have been bumped to budgie-2.0 and budgie-raven-plugin-2.0, meaning third-party applets and Raven plugins need to be rebuilt against the new interfaces.
Additionally, the team has deprecated Python-based Raven plugins to simplify the maintenance of the Raven sidebar. Fortunately, all existing Raven widgets are written in C or Vala so that the change won’t affect users. Python-based panel applets are still supported.
For more information, refer to the changelog.
