According to Bink.nu, Windows Server 2008 R2 will include Hyper-V R2, aiming to deliver the final pieces for enterprise level OS virtualization (together with SCVMM2008) and to really compete with VMware at that level.
Stephen Bink writes:
“The most anticipated is of course Live Migration: moving running VM’s from one host to another without interruption of services running inside the VM’s
To accomplisch this technique a new shared filesytem is needed and so will also be introduced in Hyper-V 2.0: Clustered Shared Volumes.
The Live migration works best together with System Center Virtual Machine Manager 2008, it can provide additional Live Migration management and orchestration scenarios such as Live Migration via policy.”