I had one of my peers comment on this, and I think the one word sums it up….
From the blog post:
…..by bringing Hyper-V from Windows Server to Windows Client, we were able to provide a robust virtualization technology designed for the scalability, security, reliability, and performance needs of most data centers. With Hyper-V, developers and IT professionals can now build a more efficient and cost-effective environment for using and testing across multiple machines.
Take a look at the full post on the Building Windows 8 blog: Bringing Hyper-V to "Windows 8" . BTW if you have not had a chance to check out the Building Windows 8 blog, you need to some great stuff and information.