MrSeb writes "Microsoft has announced the immediate availability of Windows 8 Release Preview. Unfortunately there isn't a Consumer Preview > Release Preview upgrade path — you'll have to format and perform a clean installation. After downloading the ISO, simply burn Windows 8 RP onto a USB stick or DVD, reboot, and follow the (exceedingly quick and easy) installer. Alternatively, if you don't want to format a partition, ExtremeTech has a guide on virtualizing Windows 8 with VirtualBox. After a lot of fluster on the Building Windows 8 blog, the Release Preview is actually surprisingly similar to the Consumer Preview. Despite being promised a new, flat, Desktop/Explorer UI, Aero is still the default theme in Windows 8 RP. The tutorial that will introduce new users to the brave new Start buttonless Windows 8 world is also missing. Major features that did make the cut are improved multi-monitor support — it's now easier to hit the hot corners on a multi-monitor setup, and Metro apps can be moved between displays — and the Metro version of IE10 now has a built-in Flash plug-in. There will be no further pre-releases of Windows 8: the next build will be the RTM."