The public available Release Candidate has new features:
Windows Server, Hyper-V host, and Active Directory analysis – Analyze and see alerts for these workloads on your Windows Server 2008 and 2008 R2 installations.
Multi-User support – Multiple users can access a single Advisor account.
Email Notifications – You will now receive weekly roll-up emails of alerts and changes in your environment.
SQL Server Clustering support – Advisor includes enhanced clustering support, including automatic detection when a node shifts from passive to active.
For more information on these and other new features, see what’s new.