Terrible article. It doesn't even link to the release it talks about: https://developers.google.com/android/nexus/images
Here's the OTA zip file:
http://android.clients.google.com/packages/ota/google_takju/...This is for those that are already on the leaked Jelly Bean preview (JRN84D). THIS WILL NOT WORK IF YOU'RE ON ANY ICS BUILD.
This is also only for Takju devices (yakju devices with Google Wallet).
Here is the OTA for 4.0.4 (ICS) stock to 4.1 JB:
http://android.clients.google.com/packages/ota/google_takju/...http://android.clients.google.com/packages/ota/google_maguro...
Notice the yakju and takju in the URLs to figure out which you need to download.