Windows 8 preview is out. Will it be a hit?… totally different User Interface, start button relocated, more actions (swipe, slide,zoom), Apps, Windows everywhere. Today Microsoft released a Consumer Preview Version which anyone can download here (Be advised that Microsoft gives no guarantee on anything that might go wrong it is just a Preview version). Being a preview version Windows 8 is expected to change until it will finally be released, which is expected to be late-2012 or early 2013. Check out the wiki page for more info.
Further Reading:
http://www.zdnet.com/blog/bott/windows-8-consumer-preview-a-fresh-start-for-microsoft/4540?pg=1
http://windows.microsoft.com/en-US/windows-8/consumer-preview?ocid=O_MSC_W8P_OandO_Consumer_EN-US