Hyper V is now comes to Windows 8 default, just we need to install from Windows features (Same like how we will install IIS).
Windows will support virtualization on the Windows “client” OS. Originally released for Windows Server where the technology has proven very popular and successful, we wanted to bring virtualization to a core set of scenarios for professionals using Windows. The two most common scenarios Microsoft focused on are for software developers working across multiple platforms and clients and servers, and IT professionals looking to manage virtualized clients and servers in a seamless manner. Mathew John is a program manager on Hyper-V team and authored a blog post. Bringing Hyper-V to “Windows 8”