Just flashed lean kernel 1.5 and it's working real smooth so far. Allows OC to 1500. And looks to be a good candidate for 4.2.1 and 4.2.2
Dev states that
"v1.5 is up! Basically merged in Google's 4.2.2 code. But the changes are minor so v1.4 should be forward compatible with 4.2.2, and v1.5 should also be backward compatible with 4.2.1. In other words, just upgrade to v1.5 regardless of 4.2.x you're on.
EDIT: In order to OC to 1500 and get it to stick on reboot I had to jump through a few more hoops.
Flashed lk_nexus_7jb42-lk-1.5ghz and powerhal42_lk-1.5ghz.zip
Used SetCPU app:
-MainTab - 102-1500Mhz ticked Set at Boot
-GovernorTab - I changed the hispeed freq from 130000 to 150000 and ticked Set on Boot