There seems to be some kind of misunderstanding here.
There is a difference between dual-core and 64 bit. Any process using multiple threads is capable of using a dual core processor (or any number of processors within the same machine). The operating system does need to support this (but generally all do at the moment).
To get software to use dual core capabilities the program needs to be split in separate independent threads, an exercise in carefully splitting the individual actions and coordinating access to shared recources but doable and without impact to users having only a single core processor (it just requires a rewrite of the core of the software, something long overdue for Poser anyway).
To properly use a 64 bit environment requires a complete 64 bit system with a correct OS, drivers and software (all of it should at least be 64 bit aware). This will require a few more years to stabilize. I personally expect Poser to not go this route for a few more years, although a future version may be 64 bit aware (and actually runs natively in a 64 bit environment). Keep in mind that a 64 bit version is distinctly different from a 32 bit version. This would mean for some  time 2 versions (or 4 versions including MAC) will exist at the same time (with all added complications in maintenance).