From the screen shots that King Kupa posted, it looks like P5 includes not only the setup room of the pro pack, but a ton of other things. I have the pro pack and don't use it much yet cuz I'm still getting familiar with poser. Seems to me from speculation in the posts that the price of the upgrade may be similar to the cost of the pro pack. Who knows. We will have to wait and see. I have one philosophy on computers. Whether its new hardware, upgrades in software, or purchases, I only buy when needed (not when wanted). Reason being, things change in time. That new hard drive today for x dollars would be nice, but if I don't need it for a year or so I'm confident I'll find a better hard drive for the same price next year. But if I need it now, then its time. Hope that helps.