The UI has been modified!
Probably this is the android 4.3 camera.
Tested by me on Motorola atrix2 running 4.2.2 MoKee ROM and on galaxy note on stock 4.1 !
Atrix2 doesn't have gyroscope, so no photosphere .
Photosphere works on note. Reported by others to be working on ICS and 4.1 and 4.2!
Just install it Like any other app.
1. If you have the 4.2 camera already, then you might have to remove that for this to be installed .
To remove the old camera, go to system/app and delete Gallery2.apk
And install this afterwards.
Keep a backup of old one if you want.
2. For photosphere to work, gyroscope should be present . If it's not built into your phone, photosphere won't work.( The option of photosphere won't be available at all ). All other features will work except that one.
To check if your phone has gyroscope, look at specs sheet of your phone in gsmarena or verify using antutu benchmark app. Go to device info in that app and then scroll down to sensors.
If photosphere doesn't work even if you have gyroscope, try clearing data for camera , or if you still haven't removed the old Google camera , try after removing it.
If nothing works, and you come up with your own solution, do post it here. It'll help others.
3. Making it system app with permissions might work too.
4. If you want to remove this , just uninstall either camera or the gallery app.
The lil circle on the left is the Halo. Nothing related to the camera.
Or flash this zip via custom recovery . Some issues with scene modes have been fixed. Thanks to alkspo for this.