Update: It looks like the TF700 isn't the only device new to the CM10.1 world; nightly builds are also available for the Nexus 7 (grouper) and GSM variant of the Galaxy Nexus (maguro).
The CyanogenMod team has been steadily working on getting Android 4.2 ready for nightly status, with builds already available for the Nexus 4 and Nexus 10. The newest member of the CM 10.1 family is ASUS' flagship 10" tablet: the Transformer Pad Infinity (TF700).
: A "nightly" is a bleeding edge release that is built on a daily basis, usually at night after a full day's worth of new code has been committed.
It could oftentimes be unstable and not properly tested, lacking any changelogs, but eventually evolving into alphas, betas, release candidates, and finally stable releases.
The first nightly just hit CM's official download channel, bringing with it all of Android 4.2's goodies. Head here to give it a shot, and, as always, don't forget to grab the latest GApps!