Update 1 for ColdFusion 2016 API Manager was released on 9th June 2017.
It also fixes several bugs in security, publisher portal and server core and workflows related to SOAP proxy, Swagger and SOAP to REST. For further details on the new features, the installation instructions and the manual download link refer this technote. For the list of bugs fixed with this update refer this webpage.
To be able to apply this update, ensure that you are using an API Manager installation from the latest API Manager installer. The installer was refreshed on Dec 13, 2016. An API Manager installation that has been installed with the new installer would be on build no. 301768.
Post update installation, the build for the API Manager should change to ColdFusion API Manager 2016,0,1,302960. You can validate this by using the apimanagerinfo (.sh/.bat) utility in <CFAPIM_root>/bin directory.