GNOME Boxes lead developer Felipe Borges has been overhauling the application with a major rewrite and today announced the new beta release. GNOME Boxes has migrated to using the GTK4 toolkit and libadwaita. The new GNOME Boxes code can also handle installing Microsoft Windows 11 now without needing any manual workarounds for Secure Boot or TPM requirements.
The new GNOME Boxes code also introduces a VSOCK device for accessing VM contexts and other improvements. With the revamped GNOME Boxes, it's also shifting to a Flatpak-first and only model for distributing of new GNOME Boxes releases.
Bottles Next, the successor of the current Bottles is in development. Of course it's a Rust rewrite. 🤦♂️ The project has slowed down since then considerably.