If you are interested in Group Policy stuff, here’s a new Open Specifications Documentation for Group Policy: Central Access Policies Extension that appears to be something new coming with Windows 8. To be honest with you, I guess I need to read this doc a few more times, until I could really explain in detail what this is all about, Some other articles mentioning this are Exploring Windows Server 8: Dynamic Access Control and Windows Server 8 Gets Serious about Security.