AutoCAD Civil 3D 2016 Service Pack 2 is now available and you can find it on the Autodesk Knowledge Network or via the Application Manager.
Remember to read the readme file for a list of what’s been fixed and any important information regarding the install of this service pack. There was a recent thread in the Autodesk Forums regarding some changes that SP2 made, that are not documented in the Readme. Check that out also.