Microsoft has released a technical preview of their upcoming Windows 10 (1-2Q2015) which can be downloaded by the public at http://windows.microsoft.com/en-us/windows/preview-iso. Note that this version will stop working in 2015 and should not be used for production systems. Refer to Microsoft for other requirements and disclaimers.
Here is a video of our install of the Windows 10 Technical Preview:
May also be found on YouTube.com at http://youtu.be/9EvPsa3YdAk