Generally available on September 4th
These dates are much earlier than most of us speculated earlier in the year, but it's really not surprising considering the overall very high quality of the product we've seen since the initial Developer Preview was released.
You can read Chief Architect Jeffrey Snover's blog announcing this milestone. The Windows Server 2012 launch page will allow you to save the date, and show you a few of the people involved in making it happen (I think I see Brianna there).
Follow Sean on Twitter at @shorinsean.