Vista Successor in H2 2009?

According to TG Daily, the next version of Windows (codenamed Blackcomb Vienna) could be scheduled for release as early as the second half of next year. The operating system was originally slated to be launched in 2010, but the latest roadmap from Microsoft gives Windows 7 a release-to-manufacturer (RTM) date of H2 2009. The site is also reporting that an early version of the software, being dubbed "Milestone 1" (M1), has already been shipped to key Microsoft partners. If true, this would mean that Windows Vista will only last as the company's flagship operating system for about three years - compared to the five years of Windows XP.