As it turns out, the rumors were true; Microsoft does plan on releasing its Office 2010 software suite in both 32-bit and 64-bit flavors, says ArsTechnica, who received confirmation from a Microsoft spokesperson via an email exchange.
"Yes, Office will have two separate 32-bit and 64-bit versions," the spokesperson wrote. "Office 2010 will be the first to do this."
While the benefits of running Office natively in a 64-bit environment might not be particularly exciting, making the popular software suite available as such could help expedite 64-bit adoption among other vendors. Love it or hate it, this also means a certain debt of gratitude is owed to Vista, the first mainstream Windows OS to really push 64-bit onto the masses.
Appropriately enough, look for Office 2010 to be released sometime next year.