Microsoft Source Analysis for C# has been announced. Here is what I found on the Microsoft site:

This tool is known internally within Microsoft as StyleCop, and has been used for many years now to help teams enforce a common set of best practices for layout, readability, maintainability, and documentation of C# source code.

Source Analysis is similar in many ways to Microsoft Code Analysis (specifically FxCop), but there are some important distinctions. FxCop performs its analysis on compiled binaries, while Source Analysis analyzes the source code directly. For this reason, Code Analysis focuses more on the design of the code, while Source Analysis focuses on layout, readability and documentation. Most of that information is stripped away during the compilation process, and thus cannot be analyzed by FxCop.

The ultimate goal of Source Analysis is to allow you to produce elegant, consistent code that your team members and others who view your code will find highly readable.

More info can be found here: http://blogs.msdn.com/sourceanalysis/
Source Analysis for C# can be downloaded here: https://code.msdn.microsoft.com/Release/ProjectReleases.aspx?ProjectName=sourceanalysis.