Rakesh Namineni owns the Class Designer for Visual C++, and so this is a blog I'll be watching closely. In this first post, Rakesh lays out a lot of important information about this feature, so you'll want to take a look:
The Visual Studio Class Designer lets you visualize the structure and relationships of classes and other types. Changes made to the visual designer are immediately reflected in code, and changes made to the code immediately affect the appearance of the designer. Members of a type can be visualized as compartments within the type. Members can be added and modified through a tool window called the Class Details Window that accompanies the Class Designer.