Microsoft Surface Pro and Surface RT get new firmware updates.
For Surface Pro the release note says:-
UEFI and System Aggregator (SAM) firmware update that enhances system stability, reliability, reduces power consumption, and improves touch latency with the touchpad on the Surface Type Cover and Surface Touch Cover.
For Surface RT the release note says:
1] UEFI firmware update that optimizes the audio experience at low volumes and removes a perceived pulsing in audio volume for some conten
2] Update to system drivers that enhance stability and reliability.
Updates can be downloaded either automatically via Windows Update or can be done manually.