The SCVMM 2012 Library is quite different then the SCVMM 2008 R2 library. One of the new options available when configuring a Guest OS Profile is Roles and Features. From now on it is possible to select Roles and Features in the Guest OS Profile settings. The selected Roles and Features will be installed automatically when you deploy a Virtual Machine template and choose the appropriate Guest OS Profile.
The available roles depends on the ‘Operating System’ choice you’ve made in the ‘Guest OS Profile’ settings.
So again a new feature in SCVMM 2012 that’s making life easier .