Anaconda is getting a new suit (Fedora Community Blog)

https://cockpit-project.org/ is a web interface for administering servers. Think Webmin but much more modular and sane interface with support for a wide variety of things -> https://cockpit-project.org/applications.html

A glance at https://cockpit-project.org/blog/ will give you an idea of what they support as well. Sounds like the installer team wants to leverage all the work done within Cockpit project instead of maintaining their own GTK based interface.