The 4 series of the Cinnamon desktop was released last November. Arch has it, as do (I believe) Manjaro and other Arch based distros. But I see neither hide nor hair of it in the X11 repository http://download.opensuse.org/repositories/X11:/Cinnamon:/Current/openSUSE_Tumbleweed/x86_64/– and, in my ignorance of how packages are maintained at openSUSE, wonder if openSUSE shall update Cinnamon no longer.
Also: if I understand correctly, the X11 repository is a staging area for latest-and-greatest Cinnamon versions that eventually make it to the main repositories. I experimented with it while troubleshooting the problem reported last May, https://forums.opensuse.org/showthread.php/531075-Zypper-Dup-kills-Cinnamon-desktop , but it later gave me grief, and I was grateful to remove it from my repositories list. Still, I assume that the Cinnamon new arrivals land there first.