Microsoft has announced the availability of Windows 8 Release Preview which is the final milestone before the official release of Windows 8 Operating System. According to Microsoft, Windows 8 final will be released in Summer. Windows 8 Release Preview includes Internet Explorer 10, new apps for Hotmail, Skydrive and Messanger and of course Windows Store.
There are two ISO images available, both 32bit and 64bit. If you want to give it a try download Windows 8 and install it on a virtual machine like Virtualbox or VMWare.
Have you tried Windows 8 and the Metro UI or not yet?