A really interesting “change” in the name of one of the Windows Azure components, not particular from a content point of view. Read the lines below:

“Windows Azure Active Directory is a cloud service that provides identity and access capabilities for applications on Windows Azure and Microsoft Office 365. Windows Azure Active Directory is the multi-tenant cloud service on which Microsoft Office 365 relies on for its identity infrastructure.

Windows Azure Active Directory utilizes the enterprise-grade quality and proven capabilities of Active Directory, so you can bring your applications to the cloud easily.  You can enable single sign-on, security enhanced applications, and simple interoperability with existing Active Directory deployments using Access Control Service (ACS), a feature of Windows Azure Active Directory.“

Maybe this indicates the direction of the journey… But anyway, at the moment the Windows Azure Active Directory is just the cloud implementation of AD FS 2.0 (with some custom capabilities).

Read the full article on  http://www.windowsazure.com/en-us/home/tour/access-control/