The CM team took to their Google+ page earlier this evening to announce the rollout of official CM 10.2 nightlies based on Android 4.3. They mention that not all devices they currently support are getting official nightlies right away, but will receive them when they're ready.

As of this post, there's no official roster to pinpoint exactly which device's will have a build for them. But, if you head to the CyanogenMod Downloads page, you can see if your device has a build ready for it. Once the roster is up, this post will be updated.

Tonight, we are not building for every device we support - there are always some stragglers. The rest will come when they are given the green light and that will happen when they are ready.
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- CyanogenMod on Google +