Microsoft has already started work on the next Windows iteration, apparently codenamed Windows 9.
James Akrigg, Microsoft’s head of technology for partners, confirmed at Misco Expo 12 in the United Kingdom that Windows 9 is the next major project to be released by his company.
“It should just work. I’m not going to say we’re going to do it [reach perfection] with Windows 8 because we’re already working on Windows 9,”
There is also speculation that Microsoft is working on a different Windows iteration called Windows Blue, but that is rumored to be tweaks or improvements to Windows 8.