Good points.

"then there won't be any body shape differentiation"

err why not? Now remember these are Elizabethan figures and generally the ladies refrained from stuffing cantaloupes down their blouses. The men's costumes accentuated a narrow waist and for some reason that eludes me, the calf of the leg. But that said, why cant the body shapes be altered?

As for Poser 5 .... gotta wait and see ;)