According to a couple of posts over at Reddit and Android Police, the Android 4.2.2 update has apparently started to roll out on certain Nexus devices.
Currently, the update has been spotted on GSM Galaxy Nexus smartphone, as well as the Nexus 7 and Nexus 10 tablets. Unfortunately, there are still no details regarding the actual improvements of the new update other than it is bringing improved performance and stability.
Hopefully, the update will start to appear on Nexus devices around the world so we will see more details regarding its announced performance and stability improvements.
You can check out more details at Android Police.