Microsoft has started rolling out a new update to Surface Pro 3 devices. The update bring along several changes, including improvements related to battery life, keyboard, and fingerprint sensor.
Here's the official change-log for the update:
Surface Pro System Aggregator Firmware
Surface Pro UEFI
Surface Fingerprint Sensor
Surface Pen Settings
It's worth mentioning that many users of the 2-in-1 detachable have been complaining about battery life-related problems recently. Possibly, the update fixes those issues as well.