If you happen to own a Nexus 7, Nexus S (sojua or soju versions), or the Galaxy Nexus (yakju and takju versions), then we suggest downloading these files and keeping them in a safe place in case of future software troubles. (droid-life.com)
Following the source link below you will be able to grab the Jelly Bean factory images for the Samsung - made Google Nexus S (soju and sojua versions), Samsung - made Google Galaxy Nexus (yakju and takju variants) and the Asus - made Google Nexus 7 tablet (nakasi). (pocketnow.com)
We're sure Google will be pushing out it out shortly for takju models as well, so don't fret. (phandroid.com)