While it began to trickle out to a few users at the end of February, the Android 4.1 upgrade for Sprint's Optimus G remained unannounced up until today. Here's the official changelog:

Enhancements/Fixes

- Android 4.1.2 Jellybean  
- Google Now™
- Expandable, actionable notifications
- Android Beam™ to send photos and more
- QuickTranslator application downloadable from the Application Manager
- Smoother user interface. Vsync timing across all drawing and animation done by the Android framework, including application rendering, touch events, screen composition and display refresh; and triple buffering in the graphics pipeline.
- User-installable keyboard maps
- Ability to turn off notifications on an app specific basis
- Shortcuts and widgets can automatically be re-arranged or re-sized to allow new items to fit on home screens
- Bluetooth data transfer for Android Beam
- Improved voice search
- Improved camera app
- Android mobile version of Google Chrome replaces stock Android browser
- Ability for other launchers to add widgets from the app drawer without requiring root access

Interestingly, this build is labeled as LS970ZVA, whereas the build that was rolling out to some users in February was LS970ZVB.

Read More