SharePoint 2010 and Office 2010, Visio 2010 and Project 2010 has now got to the RTM stage. More details here:
http://blogs.msdn.com/sharepoint/archive/2010/04/16/sharepoint-2010-reaches-rtm.aspx
Apr 172010
Nov 142009
You will soon be able to download the Office 2010 Beta from the Office 2010 Beta site which is here: http://officebeta.microsoft.com/
I like what I have seen of the Backstage feature. The easy-to-use view shows file level functionality in Office applications. Basically it replaces the Office and File menus. See the Excel 2010 version below.
Excel Office 2010 Backstage