Fedora developers have approved the inclusion of the Cinnamon desktop in Fedora 17 repos. The announcement comes just after inclusion of Unity in Fedora. But unlike Unity which was built using Open Suse build service, Cinnamon is going to be packaged by Fedora developers.
Cinnamon is a new desktop environment based on Gnome 3 and funded and developed by Linux Mint. Its looks similar to Gnome 2 style desktop. So those people who hate Gnome 3 shell and Unity will feel at home at Cinnamon. It is also lightweight and fast, and visually appealing as well. Cinnamon 1.4 UP1, the latest stable version of Cinnamon, will be included in Fedora repos soon.
You can read the discussion at bugzilla about inclusion of Cinnamon in Fedora.