Microsoft has added face tracking capabilities to Kinect for Windows, through the new May 2012 software update. From the official Kinect blog…
“Face Tracking Capabilities:
Makes it possible to fit a 3D mesh to users’ faces and track their facial features and head position in real time using components from the Developer Toolkit. In addition, newly added joint orientation information for skeletons is ideal for avatar animation scenarios and simple pose detection.”
Skeletal tracking (seated and standing) and speech recognition are also tweaked for improvements.