Noticed this post on google+ from a Google employee
above from https://plus.google.com/u/0/117971837164857644538/posts/4TWKCt7gPcy
The Photo Sphere team worked incredibly hard for +Android 4.3, so there are a few big quality improvements that you're going to love!
First, alignment and stitching are much better, giving you more level horizons and fewer errors throughout the image. While environments with lots of moving things are always challenging, scenes like the one attached here with a long flat horizon are now much better.
Second, we've improved exposure compensation for each individual frame, producing a beautifully exposed photo sphere. You can compare this to the previous versions that produced gray areas and inconsistent coloring in areas of high contrast (near the sun, horizons, buildings against blue sky, etc.).
above from https://plus.google.com/u/0/117971837164857644538/posts/4TWKCt7gPcy