Microsoft has started sending invitations for Office 2010 Release Candidate (RC) version to the technical testers of beta version. The users who are members on Microsoft Connect may download it from Microsoft Connect page.

See also:
Microsoft Sets Office 2010 Price
Office 2010 Screenshots
Download Microsoft Office 2010 Public Beta
Download Microsoft Office 2010 Beta 1

So, the users who have received an invitation email by Microsoft to download Office 2010 RC Build 14.0.4734.1000 must now experience it before it goes for general public release. Office 2010 RC is available in both flavors of 32 and 64 bit.

Download Office 2010 RC