Just an FYI, there are third party apps that work similarly that have been out for a while - you have to upload the result to a website to see it the way Photosphere's show up, and you can't embed them in G+ or Facebook, you can just link to them, but aside from that they are pretty similar. I use +360 Panorama
, and before that I used Pano. Both did the stitching and visual line up on screen, Pano required you take each photo with a tap, 360 Panorama you tap for the first photo, and then just slowly pan around and it takes them all and merges them in realtime. Pretty cool.