According to DanBa's list https://docs.google.com/file/d/0B3XYy1FuzDUecWx6Vmt0NlhUM1U/ both 2012 and 2013 Nexus 7 deliver, when using UARP. So that means those tablets have the right stuff hardware. Just a question of CM (or even Google) adding proper OS support. Someday.
See the last paragraph of the post you replied to:
But speaking of 2012 Nexus 7, if you go to the rootzwiki forums, there is a rom/kernel developed by "Timur" which provides full USB Audio support. It's popular among 2012 N7 owners especially those who are using nexus 7's for car installations, but you can use it for head fi purposes too. It might be an older version of android (4.2.2?), but it works. Just FYI. (but if I wanted USB audio support on my 2012 N7, I'd try CM11 first and then go to this since this Timur Rom is a 4.2.x rom)
On the 2012 Nexus 7, if CM11 doesn't work, use Timur's USB rom/kernel and you're set. 2013 Nexus 7 has already been confirmed here with CM11.
Edited by pappy97 - 12/6/13 at 9:30am