Google released an update to the Google Camera on the Play Store just a few days ago that brought some Android Wear functionality. Also part of that update isn’t quite as big, but it does fix a lot of issues that users had with Photo Sphere and related modes.
Photo Sphere has been improved so it has a larger target area, which is extremely helpful in bright sunlight. This change should make creating Photo Spheres much, much easier. Aside from that small tweak, Photo Spheres should use less memory during the stitching process, which will supposedly cut down on crashes in the camera app. That performance change should also affect related camera modes, including Fish Eye, Panorama, and Wide Angle.