Humm looks like a secret that crept out or should I say was forced out! The Beta is not due out until April 2007 with release in Q2, so not that long to wait now. Source: http://msexchangeteam.com/archive/2007/02/23/435699.aspx
Standby Continuous Replication (SCR) With Exchange 2007, we introduced Clustered Continuous Replication (CCR) for replication of data between 2 servers within a cluster within the same datacenter. With SCR, data replicates to a non-clustered server in a remote datacenter. If the primary datacenter becomes unavailable, the standby replica in the second datacenter is readily available to be activated.
OWA SP1 will fill in the feature holes that we just didn’t have time to complete by RTM: Personal distribution lists; S/MIME; Rules; Monthly calendar view; Deleted items recovery; Public folder access; OWA 2007 SP1 will add support for viewing Office 2007 file formats as HTML.
Exchange Management Console SP1 will fill in the GUI holes that we just didn’t have time to complete by RTM, including: Public folder configuration; POP and IMAP configuration; SendAs permission configuration; Delegation wizard scenarios; Web Services
New web service coverage will include: Public folder access ; Delegate management
Folder permission management; IPv6
On Longhorn Server, we will support Exchange 2007 on native IPv6 networks.
Move Mailbox This vital tool administrator tool has been beefed up to include import and export to a .pst