According to Zane Adam, senior director of virtualization and System Center, Microsoft Hyper-V Server 2008 R2 will continue to be free, and now will include live migration and host clustering capabilities…
Customers won’t need to pay thousands of dollars for alternate Virtualization platforms to get these features. With Microsoft Hyper-V Server 2008 R2, customers have a solution for both planned and unplanned downtime and can use it for scenarios like server consolidation, branch server consolidation, high availability (HA), and VDI.
You can download Microsoft Hyper-V Server 2008 R2 beta here. Microsoft Hyper-V Server 2008 R2 can be managed by System Center Virtual Machine Manager 2008 R2. You can download the beta here.
You can find more info on Microsoft’s virtualization products and solutions at http://www.microsoft.com/virtualization.