On a tangent, does anyone know anything about the in-browser editor they are using for the playground? It seems really slick. The javascript references something called "monaco" and the directories are all prefixed with "vs".

The code is hosted on their demo site; /Script/vs/editor/editor.main.js appears to be the main js file and has this notice:

    /*!
        © Microsoft. All rights reserved.

        This library is supported for use in Windows Store apps only.

        Build: 1.0.8514.0.win8_rtm.120711-1900
  
        Version: Microsoft.WinJS.1.0
    */