Seems like the official changelog doesn't mention any changes to the controller specifically... are they going to hold off on that till March?
New/updated Features
Update to My Game & Apps to allow sorting of games and application lists, and separate queue lists for games, applications and installs
Ability to delete game and application save data
Improved installation and DLC management
Addition of the controller battery power indicator
Improved UI for accessing friends, achievements, messages, and party chat
Game DVR app to be included in the Xbox OneGuide as an app channel
Update to the boot progress indicators for system update
Improve consistency of UX for update & install progress
Separate game, application, and install queue lists
Addition of USB keyboard support
Stability and performance update
Improved NAT detection
Network Troubleshooter improvements
Blu-ray quality improvements
Significant performance and stability improvements
http://support.xbox.com/en-US/xbox-one/system/system-update-operating-system