Well, Poser itself is still a 32 bit application in the new "Pro" version, only firefly (the render engine) is 64 bit, but in all honesty other than being able to render slightly larger scenes without memory issues it's really not much to write home about.

The new network and render in background features are nice, but firefly itself hasn't improved in render quality much at all, which is really a shame. 

-Never fear, RenderDog is near!  Oh wait, is that a chew toy?  Yup. ok, nevermind.. go back to fearing...