CyanogenMod 10.1 hitting final builds, release set for tonight
But, the roster of devices that are getting the full version today was fairly limited at the time of this writing. All variants of the Samsung Galaxy S III have gotten the update, along with the Nexus S, Nexus S 4G, and B&N Nook Tablet. There may be more devices added to the list before the night is out, we'd expect that the other Nexus devices should be added to the list soon enough.
In addition to the update, the team has also merged Privacy Guard into the nightly builds of CM10.1 Privacy Guard had been known as Incognito Mode, which basically sandboxes your personal data from apps.