The StyleCop team announced the release of a version 4.3 of the StyleCop tool. You can get it from here.
On this version there are some bug fixes, new rules and documentation.
Also in this version, the list of errors and warnings goes to the Errors List window like with the compilers. I whish that the errors and warnings would also be sent to the Output window.
SDK documentation on how to author custom rules and integrate the tool with custom build environments is expected soon.