Windows 2012 RC brings some pretty nice features. Here you have some documentation regarding this:

Over on the Microsoft Server and Cloud Platform site we have:

• Hyper-V Comparison Guide
  • This document steps you through the differences between Hyper-V on Windows Server 2008 R2 SP1 and Hyper-V on the Windows Server 2012 Release Candidate
• Competitive Advantages of Windows Server 2012 RC Hyper-V
  • Goes through and looks at how Hyper-V on the Windows Server 2012 Release Candidate is stacking up against VMware.

Meanwhile – on our TechNet Library we have:

• Hyper-V Replica Deployment Guide
  • This steps you through everything you need to know to get Hyper-V Replica up and running
• Configure and Use Live Migration Without Failover Clustering for Server Availability
  • Tells you everything that you need to know to live migrate a virtual machine without a cluster