Talk about subliminal messages. Microsoft, on their Netherlands website had a press release regarding the first birthday of Windows 7. In that press release, it was hinted (after Google's Translator worked its magic) that the next Windows product could be expected in 2 years.
Steve Ballmer has already called Microsoft 8 the company's riskiest product bet. Taking two years for their next big launch is certainly stitched in with some big hopes for Microsoft 8.