Truely, SharePoint 2007 is a revolution by itself. One will be amazed to find the enhancements and the new features that has been incorporated in the new version of SharePoint. Now that at least some information is available publicly, let me add my 2 cents here.
A great resource to find out the new and improved features is located at : http://download.microsoft.com/download/5/D/C/5DC09195-7D74-4A5D-AFED-62C000648A15/SharePointGuide.doc. Overview of other products in Office 2007 Suite is avalable at: http://www.microsoft.com/office/preview/default.mspx
As far as SharePoint is concerned, every bit of it has undergone great changes. Almost every pain areas of SharePoint 2003 has been addressed in this release and a host of new feature including the much awaited WorkFlow functionality has been added. Moving ahead in next few weeks I will dedicate some time in writing detailed description of each new and enhanced feature of SharePoint 2007.
This posting is provided "AS IS" with no warranties, and confers no rights.