If you just can't wait for Google to release Jelly Bean 4.2, and you are wanting to sample photosphere right now then you are in luck. Dev "garner" at XDA has put together a working app for the Galaxy Nexus. Simply grab the zip file from the source link below and flash in custom recovery. So far this has full photosphere and panorama functionality. It also has the editing features of the app. Of course it is not 100% complete and this version is only for the Galaxy Nexus, but a quick search will yield results for the app on your phone too!