For those who can't wait can just download the developer version.
Windows 8 Developer Version Is Available For Download
The Windows Developer Preview comes in three different flavors which include one each for 64-bit and 32-bit machines as well as a 64-bit version that is bundled together with developer tools. Microsoft claimed that the Windows Developer Preview can be run on the same hardware as per Windows Vista and Windows 7 which require at least a 1GHz processor, 1 to 2GB or RAM, 16 to 20GB of disk space and a DirectX 9 graphics card with WDDM 1.0 or higher driver. Of course, if you would like to check out Windows 8 much touted touch capabilities, then you would need a multi-touch display as well.
No activation is needed to run Windows Developer Preview on your machine but since it is a pre-release software, Microsoft is not providing any support or warranty for the operating system. So, if you are ready to taste the next chapter of Microsoft Windows, head on to THIS link to download it.