My wife's yakju Galaxy Nexus just got an OTA update to JWR66Y. Not sure why but she always seems to be among the first to get them.
http://android.clients.google.com/packages/ota/google_maguro/1b0ac7dfb2907e5981f1af24b9e5b005712bd4ee.signed-yakju-JWR66Y-from-JWR66V.1b0ac7df.zip
http://android.clients.google.com/packages/ota/google_maguro/1b0ac7dfb2907e5981f1af24b9e5b005712bd4ee.signed-yakju-JWR66Y-from-JWR66V.1b0ac7df.zip