Just picked this up from the SharePoint team blog – SharePoint 2010 & Office 2010 Launch:
Today, we officially announced that May 12th, 2010, is the launch date for SharePoint 2010 & Office 2010. In addition, we announced our intent to RTM (Release to Manufacturing) this April 2010.
It’s an exciting time for us! We hope you can virtually join us on May 12th at 11am EST to listen to Stephen Elop, President of the Microsoft Business Division, announce the launch. You can register for the event @ http://sharepoint.microsoft.com/businessproductivity/proof/pages/2010-launch-events.aspx.