this Google code bug forum as well as several other technical forums this morning, the promised delivery of a less buggy Qualcomm wifi driver did not occur with this release.
Imagine my surprise. Another turd sandwich. WiFi on the Nexus 4 still effectively turns itself off when the screen is blanked.
Ok, it's a few minutes later now, and 4.2.2 is installed. In the interest of completeness, I decided to test to see if the very first bug I encountered with the Nexus 4 last December still exists. This is the bug that if your phone is connected to WiFi and you place a call while using a bluetooth headset, bluetooth kills the phone's WiFi as soon as the call initiates.
You're still batting 1,000, Google.
So now I need to decide if I'm going to send this, my 4th Google Nexus 4 back (see the story about the previous three here, if you're interested), or hang on to it out of morbid fascination to see if Google ever does manage to fix it.