Here is the official Office Team Blog announcement with more details: Official Office Team Blog Announcement

And for SharePoint: Service Pack 1 Changes to SharePoint 2010

SharePoint 2010 and Office 2010 Service Packs 1 are now available for download. Here are the direct download links:

Service Pack 1 for SharePoint Server 2010

Service Pack 1 for Microsoft Office 2010 (KB2460049) 32-bit Edition

http://www.microsoft.com/download/en/details.aspx?id=26622

Service Pack 1 for Microsoft Office 2010 (KB2460049) 64-bit Edition

http://www.microsoft.com/download/en/details.aspx?id=26617

And the KB articles listing an overview of the SP1 improvements and technical details:

KB2460049 Description of Office 2010 SP1

http://support.microsoft.com/kb/2460049

KB2532118 Technical details about the Microsoft Office 2010 Service Pack 1 (SP1) releases

http://support.microsoft.com/kb/2532118

Excel spread sheet of fixes: Issues Fixed by Service Pack 1 (SP1) in the Office 2010 Desktop Applications

Also the latest version of the Group Policy template files and OCT files for the SP1 release of Office 2010 are also now available for download:

Office 2010 Administrative Template files (ADM, ADMX/ADML) and Office Customisation Tool

http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=18968

Office 2010 Administrative Template files (ADM, ADMX, ADML) and Office Customisation Tool

http://technet.microsoft.com/en-us/library/cc178992.aspx