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I don't know of any official documents on the subject, but one thing that could be a big win for Arbortext users is the ability of the 64-bit version to access more memory (assuming your system has it). That would definitely come in handy for processing some of those multi-kilopage documents.
I can't find anything on PTC's website and a Google search only turns up websites with potentially questionable security problems, mostly software download sites.