Microsoft released to manufacturing (finalised) on Friday 16th April Office 2010, SharePoint 2010, Visio 2010, and Project 2010The product will be available via the following mediums on.
TechNet/MSDN – 22nd April 2010
Volume Licensing with Software Assurance – 27th April 2010
Volume Licensing without Software Assurance – 1st May 2010
Public – Microsoft Office 2010 officially launches on 12th May 2010 and should be in the shops around June.
Official Blog Post.