The T-Mobile Moto X got it's surprise update the other day with a couple nice fixes and enhancements, and now it's Sprint's turn to get the update. It's rolling out in stages, so mashing the update button won't do any good. Not that anyone's stopping you from trying.
The software, with the easy to remember version number 13.9.0Q2.X-116-MX-17-57-1, appears to have the same changelog we got with the T-mobile update, but here it is again anyway:
Camera – Improved Photo Quality: Improved capture of natural light (auto-white balance) and color accuracy for more precise exposure in outdoor and backlit scenes.