I found this in my inbox this morning ( I saw that this was mentioned here as well:
Dear SCVMM beta tester, As a past beta tester of the System Center Virtual Machine Manager 2008 software, we wanted to notify you at that new Beta release of the "R2" release for VMM 2008 is now available on Microsoft Connect for download. What is VMM 2008 R2 Beta and what are its new capabilities? VMM 2008 R2 Beta is a comprehensive management solution for virtualized infrastructure that takes advantage of many of the great new features of Windows Server 2008 R2 Beta including:So who is ready or will to try it out? You can sign up for the Beta here
- Live Migration: Enables the movement of running virtual machines from one virtual host to another with no downtime.
- Clustered Shared Volumes: Helps enable Live Migration and eliminates the previous one LUN per virtual machine requirement thus simplifying SAN administration.
- Hot addition/removal of storage: Allows the addition and removal of new virtual hard disks (VHDs) and iSCSI pass-through disks running on virtual infrastructure.
- Networking optimizations: two new technologies -- Virtual Machine Queue (VMQ) and Chimney - provide increased network throughput while reducing CPU load.