OK gentlemen, this is definitely a testing build. It requires you first install the IMM76Q update. So you need to flash to IMM76K, upgrade to IMM76Q, then to JRO03O. The link is here:

http://android.clients.google.com/pa...Q.4a91da6c.zip

All the thanks goes to El Madhatter. I'm mirroring the file at randomphantasmagoria.com as I speak.

Daily Drivers:
Samsung Galaxy Nexus (SCH-I515/Verizon) :: mysid 4.2.2/JDQ39 :: Radio I515.FK01 (CDMA) / I515.FK02 (LTE) :: Bootloader PRIMELC03
Motorola Xoom (MZ602/Verizon) :: trygon 4.0.4/IMM76L :: Radio 03.1A.65P (CDMA) / 07.1F.00 (LTE) :: Bootloader 1050

Toys:
LG Nexus 4 (LGE960/AT&T) :: occam 4.2.2/JDQ39 :: Radio 2.0.1700.48 :: Bootloader MAKOZ10O
Asus Nexus 7 (ME370T) :: nakasi 4.2.2/JDQ39 :: Bootloader 4.18
Samsung Nexus 10 (GT-P8110) :: mantaray 4.2.2/JDQ39 :: Bootloader MANTALJ12

OTAs and factory images, past and present, for every Nexus and "Google Experience" device since the HTC Magic at http://www.randomphantasmagoria.com/firmware