I asked @cj360
about it since he's already started building for his XT926, and once he gets it stable on there, he'll start building for all the other devices in the family.
As for building it yourself, AOSPA sources are here
and our sources are here.
Sent from my MB886 using Tapatalk
LG G2 - Stock ATT 4.4.2
Atrix HD - Stock ATT 4.1.1