Vista Successor Due in 2009
Microsoft has announced that the follow up to Windows Vista will come in 2009, about 2 and a half years after Windows XP SP2, but if you count it from the time when XP first came out, it is a lot longer than 2 and a half years.
Microsoft originally planned for its XP follow-up to include a number of radical changes to Windows, including a new file system and a reinvented user interface, but after the company’s products were hit by widespread worm outbreaks in 2003, Microsoft redirected almost its entire engineering effort to locking down Windows with the XP Service Pack 2 release.
“We put Longhorn on the back burner for awhile,” Fathi said. “Then when we came back to it, we realized that there were incremental things that we wanted to do, and significant improvements that we wanted to make in Vista that we couldn’t deliver in one release.” Source: Microsoft: Vista follow-up likely in 2009
The code name for the release used to be Vienna, but they are not allowed to talk about what it is called now, and really wouldn’t comment on new features, but did mention a new user interface paradigm.