The MS Office 2010 Release Candidate (RC) v14.0.4734.1000 had already been released to Microsoft Connect.
This is now available for a few beta testers who are members of TAP (Technology Adoption Program). Both the 32-bit (x86) and 64-bit (x64) versions of Office 2010 RC builds can be downloaded for free via torrents.
Download MS Office 2010 x86 Professional Plus v14.0.4734.1000
File Name: 14.0.4734.1000_ProfessionalPlus_retail_ship_x86_en-us_exe.exe
Download MS Office 2010 x64 Professional Plus v14.0.4734.1000
File Name: 14.0.4734.1000_ProfessionalPlus_retail_ship_x64_en-us_exe.exe
Office 2010 RC setup installer will ask you for a product key to be entered prior to the installation process. You have to secure a valid product key or else you cannot install the software at all.