You’ll find some really great features in this release like Pedlar’s notification powerbar, insane performance boosts on all platforms (install SetCPU if you want to take it further), powerful new features in the camera app, new email features, a whole lot of other great stuff!
If you use ROM Manager you may have already been notified of the update, or you can get a link to the build in your specific device forums.
Remember, these are only release candidates. So while CM and company have deemed them appropriate for mass distribution you may come across unforeseen hiccups.
Models ready for 6.1.0RC1:
[via CyanogenMod]