"Woohoo! My Nexus S is running Jelly bean and it's already smooth as butter, I can't wait to get this update!"
Sorry to disappoint you, I believe Nexus S will not get 4.2
"With my Nexus 7 being rooted, I have to install the update off the SD card with clockworkmod recovery, they should put something int he update so it works over the air for rooted users."
I thought it is very clear that rooted devices were not supported for OTA. With a Nexus 7, I have no reason to root. In fact, I don't even root my SGS3 because it's already doing what I wanted with 4.0.4.
Can you be overrooting? is there a such term?