Canonical has released Ubuntu 21.10 with the Linux 5.13 kernel and GNOME 40. Firefox is now packaged as a snap that's managed directly by Mozilla and Canonical so updates should arrive quicker.
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The Fedora Project has announced the release of Fedora 34. It comes with GNOME 40, transparent compression on BTRFS and an i3 window manager Fedora Spin. Fedora 33 users can also upgrade now.
The Fedora Project has made Fedora 34 beta available for download. This version comes with GNOME 40, PipeWire, and transparent compression in BTRFS which will extend the life of SSDs.