At least according to this interview. Could be bluffing. [video=youtube;pLZJD9NzCyM]https://www.youtube.com/watch?v=pLZJD9NzCyM[/video]
Nate Diaz isn't impressed. http://mmajunkie.com/2014/12/nate-diaz-slams-ufcs-cm-punk-signing-f-ck-him-f-ck-the-whole-situation