The JWR66Y Over The Air update we reported on Nexus 10. The update is not the 4.3.1 build everyone is waiting for, but it does make some minor improvements.
On the brand-new side of things, the new Nexus 7 (2013) has received a new update in a different direction, JSS15Q, which resolves the spooky ghost fingers multi-touch issue and supposedly also repairs the GPS lock issues. Our new Nexus 7 hasn't received the OTA update yet, but we couldn't duplicate any of the multi-touch issues we've seen described anyway.
Factory Images have also appeared at Google for these devices and can be found here:
Nexus 7 (2012) Wi-Fi: JWR66Y (android-4.3_r1.1)
Nexus 7 (2012) HSPA: JWR66Y (android-4.3_r1.1)
Nexus 7 (2013): JSS15Q (android-4.3_r2.2)
Nexus 10: JWR66Y (android-4.3_r1.1)
Have you flashed the Factory Images for any of these devices yet? Found anything interesting in the OTA updates?