Windows 8 Release Preview is a prerelease version of Windows 8 that focuses on people and apps and gives you powerful new ways to use social technologies to connect with the people who are important to you. It's Windows reimagined. Windows 8 Release Preview is built on the rock-solid foundation of Windows 7 and has the security and reliability features you expect from Windows, but we’ve made it even better. It’s fast, and it’s made to work on a variety of form factors—especially the new generation of touch devices.

Windows 8 Release Preview ISO images: 32-bit | 64-bit

Product Key: TK8TP-9JN6P-7X7WW-RFFTV-B7QPF

Important: If you decide to go back to your previous operating system, you'll need to reinstall it from the recovery or installation media that came with your PC, which is typically DVD media. If you don’t have recovery media, you might be able to create it from a recovery partition on your PC using software provided by your PC manufacturer. Check the support section of your PC manufacturer’s website for more information. After you install Windows 8, you won’t be able to use the recovery partition on your PC to go back to your previous version of Windows.

Windows 8 Release Preview homepage