Microsoft offers Group Policy Settings Reference and Administrative Templates for Windows Internet Explorer 9 RTM via the Microsoft Download Center.
Group Policy Settings Reference Windows Internet Explorer 9 spreadsheet lists the policy settings for computer and user configurations included in the administrative template files (admx/adml) delivered with IE9.
The policy settings included in this spreadsheet cover Internet Explorer 5, Internet Explorer 6, Internet Explorer 7, Internet Explorer 8 and IE9. These files are used to expose policy settings when you edit Group Policy objects (GPOs) using Group Policy Object Editor (also known as GPEdit).
Administrative Templates for Windows Internet Explorer 9 provides the Group Policy Administrative Template files for IE9.
Administrative Template files are used to populate user interface settings in the Group Policy Object Editor, enabling administrators to manage registry-based policy settings. For Windows 7, Windows Server 2008 R2, Windows Vista and Windows Server 2008, installing IE9 will also install the IE9 Administrative Templates. However, for Windows Server 2003, the Administrative Template files need to be manually imported, as IE9 installation isn't supported on that Operating System. An IT Admin may want to manage Group Policy settings on a mixed environment of IE9 and earlier versions from a Windows Server 2003 machine.