Just yesterday, we shared that the first CyanogenMod 13 nightlies were available for a few select devices. Surprisingly, noticeably absent were the most recent Nexus devices. The CyanogenMod team did say more devices would be supported within the next couple of weeks, but it has only been a few days. Joining the Nexus 7 (deb and flo) are now the Nexus 6P (angler) and Nexus 5X (bullhead).
The Nexus 6P and Nexus 5X are already on the most recent build of Android, which happens to be Android Marshmallow, but it lacks customization. CyanogenMod, one of the most popular custom ROMs on the internet brings many customizations like themes, different performance profiles, and my personal favorite, the circular battery icon.
Just to forewarn, these builds are not very stable, but will continue to be worked on daily. If you are itching to get your phone running CM 13, it’ll work, but there may be some unknown bugs or issues. If you are more patient like myself, I’d wait a week or two and revisit.