I see that useful right-click Group feature one can add to Tree view. I guess some could argue why not (in addition) Draft VisGroup. Maybe because features like Module would fit better on such toolbar in the future.
Anyway i am happy consensus was build around Part icon. To me it i guess does make sense to try out new Body icon and see how it goes. As for Assembly icon. Too bad no new features for that in FreeCAD 0.17.
But the icon looks good and that in the end is something. As for the Group icon i guess proposals welcomed.