Over the past few years, you've asked us to make some changes to Windows. We listened closely. Now it's time to share an early look at how we've used your feedback. Windows 7 is faster, more reliable, and makes it easier to do what you want. Both the everyday things and the killer "is that really possible?" things. Dig into this site to see what's coming. Want to try the Beta? Come back the afternoon of January 9. And remember—this is just a preview. There's more to come.
Something to keep in mind is that Vista was in beta for almost 2 years before RTM. Take that for what you will.