What's New for Modeling Tools in Visual Studio 2013
Visual Studio Ultimate supports these new tasks to help you understand complex or unfamiliar code:
Map relationships as you trace through code without leaving the editor
Code maps appear next to the editor so you can easily see your place in the code while you work. You can also use code maps to navigate around your code.
Map X++ code and solutions that share code across multiple apps
With Visual Studio 2013 Update 3, you get color-coded relationships.
Find changes to your code in other branches without leaving the editor
With Visual Studio 2013 Update 3, you can find changes to your code in Git. If your Git repository is hosted in TfGit, you can also find links to TFS work items, whether on-premises or in Visual Studio Online.