As we know that Microsft has finally released the Windows 8 Release Preview or Windows 8 Release candidate.
Previously we are familiar with Windows 8 Devloper Preview & Windows 8 Consumer Preview. But as the news its the last beta preview they resealed before Windows 8 Final Release.
Windows 8 is the next version of Microsoft Windows, a series of operating systems produced by Microsoft for use on personal computers, including home and business desktops, laptops, Microsoft Tablet PCs, and Home theater PCs. According to unofficial sources, the release date for Windows 8 has been set for October 2012, three years after the release of its well known, Windows 7. Windows 8's server counterpart, Windows Server 2012, is in development concurrently with Windows 8. The most recent official pre-release version of Windows 8 is the Release Preview, which was released on May 31, 2012.
Unlike Windows 7, which was intended to be a more focused, incremental upgrade to the Windows line, Windows 8 has been "reimagined from the chipset to the user experience" to connect more with the user. It features a new user interface inspired by Microsoft's Metro design language that can be used for multiple input methods, including touchscreen input similar to that in Windows Phone