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.
Every OTA update for every Nexus and Google Experience device since the Motorola Droid at http://www.randomphantasmagoria.com/firmware.

LG G3 (LG-LS990 / Sprint) :: LS990ZV4 (Android 4.4.2 / KVT49L)
Samsung Galaxy Tab 4 8.0 (SM-T337A / AT&T) :: T337AUCU1ANF4 (Android 4.4.2 / KOT49H)
Samsung Galaxy Note Pro 12.2 (SM-P907A / AT&T) :: P907AUCU1AND7 (Android 4.4.2 / KOT49H)

Coming Soon:
Samsung Galaxy Tab S 8.4 (SM-T707A / AT&T)
Samsung Galaxy Note 4 (SM-N910A / AT&T)