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The face tracking feature not being implemented on the latest SDK is documented here http://www.intel.com/content/www/us/en/support/emerging-technologies/intel-realsense-technology/000023222.html . The only information at the moment is what’s described in the aforementioned document:” Face support may be released as a separate MW in the future.”
There is no timeline yet but, if and when it is released it will be available for download as an independent module in the SDK download page https://software.intel.com/en-us/intel-realsense-sdk/download
As an alternative, face tracking is still available in the previous SDK releases.