While Android 4.2 did not get a new name, it did bring some new features including a completely over-hauled camera app with a new feature called PhotoSphere. It is just a matter of a few weeks, or perhaps days, before Google starts rolling out the Android 4.2 Jelly Bean update for the Galaxy Nexus and the Nexus 10, bringing these new features to the devices.
However, if you cannot wait for the OTA update to land to enjoy PhotoSphere and the updated camera UI on your Galaxy Nexus or Nexus S, don’t worry the Android community has got you covered.
dmmarck of Android Central forums has managed to get his hands on the working Camera and Gallery app from Android 4.2 Jelly Bean. Keep in mind that the camera and gallery app are basically the same in Android, so both the apps will be replaced at once.
You need root access to install the Android 4.2 camera app on your phone though. Download the file from here and transfer it to your phone. Then simply flash it via a custom recovery and enjoy the new camera app and updated gallery along with PhotoSphere.
Flashing the above zip file may not replace the stock Camera and Gallery app on your device, and you will end up with two camera and gallery shortcuts in your app drawer. If you still get the old Camera UI, open the new Gallery app and then press the Camera shortcut button at the top-right.
The flashable zip will work flawlessly on the Nexus devices, and might work on other Android devices running AOSP ROM.