If you happen to be a fan of CyanogenMod and are willing to live on the edge in terms of ROMs, there is now a CM10.1 nightly build available for the Nexus 4. In addition, a similar ROM is also being worked on for the Nexus 10 tablet.
CyanogenMod 10.1 progress is moving along, but the end result is still not near ready for release
While CyanogenMod 10 has recently come available as a stable release (for select devices), we are already hearing talk of the 4.2 merger -- CyanogenMod 10.1. Except while there is talk and there is progress being made, a recent status update suggests any availability is still some time away.