Cinnamon normally has incremental updates. If you’re hoping for some massive new features update, you’re going to be disappointed. I think at most you might get a Wayland option.
On Linux Mint you have that option, I don’t think it’s on Linux Mint Debian Edition yet and not sure about Arch.
But at for the look and feel etc, I don’t expect to see any change. I’m assuming the default cinnamon you install on Arch is pretty bland and not as nice as the LM version. But you just need to find out how they themed it to get the same cool look.
The only improvement I’d like to see is an auto dark mode at sunset option added. The rest is fine by me. I run Linux Mint Debian Edition.