While creating an extrusion in a family the other day I noticed a subtle change to the sketch lines.  In Revit 2016 or prior when a sketch line was selected there was a property “Visible” which could be turned ticked off, or a parameter could be added to the variable.  This did absolutely nothing for the sketch or the family.  In Revit 2016 R2 this property value has been removed.  Not a big deal but removing unnecessary values to objects does make things cleaner and less confusing.