Progress never rests, and apparently neither does the CyanogenMod team. Because just a couple weeks after the release of Android 4.3 Jelly Bean, the CyanogenMod team has started rolling out the CyanogenMod 10.2 nightlies for select devices. So far, there are only a few devices on the list, and all are from Samsung.
The team hasn’t listed what devices are getting the update, or what the timetable is on the rollout, but as of this writing there were CM 10.2 nightlies available for nine devices: the Samsung Galaxy S III for AT&T, Verizon, Sprint, T-Mobile, Cricket, Metro PCS, and U.S. Cellular, plus the Samsung Captivate, and the Samsung Relay 4G.
There are more nightlies rolling out all the time, so keep checking the download page for new additions. Keep in mind that this new ROM will require the 4.3 GApps pack.