Hyper-V is all new in Microsoft Windows Server 2012. As a bonus, Hyper-V is also available in the desktop client OS - Windows 8. Microsoft has published a "survival guide" to Client Hyper-V that details hardware and software requirements, management, and scalability.
Client Hyper-V let you use both Hyper-V virtualization and wireless network adapters and sleep states on your desktop machine. For example, if you are running Client Hyper-V on a laptop and close the lid, the VMs that are running will be put into a saved state, and can be resumed when the machine wakes.
There a few features included in Windows Server 8 Hyper-V that are not included in Client Hyper-V. These include:
- Remote FX capability to virtualize GPUs (software GPU in RDP 8)
- Live VM migration
- Hyper-V Replica
- SR-IOV networking
- Synthetic fibre channel