Good news, the latest nighly is build from jb source
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Since Sun Apr 14 20:30:30 UTC 2013
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* device/lge/msm7x27a-common
04c4877 Updated configurations for jb_2.5-based source
* device/lge/p700
9bf98a9 Updated configurations for jb_2.5-based source
https://github.com/CyanogenMod/android_device_lge_p700
Yeah thats nice but I don't think the kernel is based on official JB too:
https://github.com/CyanogenMod/lge-kernel-p700