An error during the 64-bit installation of Office 2010 build 14.0.4006.1010 seems to suggest that Microsoft will release the 32-bit and 64-bit flavors on one DVD.
Full Story: Office 2010 32-bit and 64-bit coming on one DVD? - Ars Technica
Full Story: Office 2010 32-bit and 64-bit coming on one DVD? - Ars Technica