Windows 8 is the codename of the next version of Microsoft Windows, a family of operating systems produced by Microsoft for use on personal computers, including home and business desktops, laptops, netbooks, tablet PCs, servers and media center PCs.
It adds support for ARM microprocessors in addition to the traditional x86 microprocessors from Intel & AMD.
Its user interface has been changed to make it better suitable for touchscreen input in addition to the traditional mouse and keyboard input.
Saw the advance screens and functionality on PC World's website. Looks like a big improvement over 7 and employs both standard Windows with the touch screen capability of the tablet. Start-up was almost instantaneous and Microsoft claims that all Windows 7 apps will run flawlessly with it and no need to upgrade your system if you are already running 7. Windows Defender is a full virus protection and spyware protector. I am withholding a full 5 rating until I am able to try it myself.