Since Windows 7 has been released to public, Microsoft has started working on the next Windows version which is codenamed as "Windows 8" at the moment.
"Stephen Chapman" @ Microsoft Kitchen posted a Windows roadmap which clearly shows that Windows 8 is scheduled to release in 2012. Microsoft has also mentioned in past that it'll try to keep a fixed 3 years gap between future Windows releases and it seems that they are really working hard to maintain this gap.
What?? even the prices of Win7 is up high, it doesn't make any sense to create a new OS in order to make them popular.. Gee, MS surely arrogant n all they think is bloodsucking peoples money~ Oh well, if this really true, I hope its not just an upgade of the GUI of Win7..